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SusanAthena
SusanAthena, Master's Degree
Category: Calculus and Above
Satisfied Customers: 4329
Experience:  Tutor for Algebra, Geometry, Statistics. Explaining math in plain English.
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1.(TCO 5) We have a binomial experiment with p = 0.4 and n

Customer Question

1.(TCO 5) We have a binomial experiment with p = 0.4 and n = 2.

(A) Set up the probability distribution by showing all x values and their associated probabilities.

(B) Compute the mean, variance, and standard deviation.


2. (TCO 4) What is the probability that the student carries a credit card given he's a sophomore?
Class Credit Card Carrier Not a Credit Card Carrier Total
Freshman 33 27 60
Sophomore 6 34 40
Total 39 61 100


3. Some students were asked if they carry a credit card. Here are the responses.
Class Credit Card Carrier Not a Credit Card Carrier Total
Freshman 33 27 60
Sophomore 6 34 40
Total 39 61 100



4. (TCO 4) What is the probability that the student is a sophomore and doesn't carry a credit card?
Class Credit Card Carrier Not a Credit Card Carrier Total
Freshman 33 27 60
Sophomore 6 34 40
Total 39 61 100
Submitted: 2 years ago.
Category: Calculus and Above
Expert:  SusanAthena replied 2 years ago.
Hi. Thank you for your question.

It looks like there's a question missing for part 3.

Can you please add it?

Kind regards,
Susan
Customer: replied 2 years ago.
Part 3. What is the probability that the student didn't carry a credit card?
Expert:  SusanAthena replied 2 years ago.
Thanks for your questions.

Your answers are below. If you have any questions, please feel free to follow up.

If my answers are helpful, please click Accept, so that I can get credit for my work.

Kind regards,
Susan



1.

Using Excel

x p(x)
0 0.36
1 0.48
2 0.16

x p(x) x * p(x) x^2 * p(x)
0 0.36 0 0
1 0.48 0.48 0.48
2 0.16 0.32 0.64
SUM 1 0.8 1.12


Mean (µ) of a probability distribution is ∑[x*p(x)] = 0.8
Variance (s^2) = ∑(x^2 * p[x]) - µ^2
s^2 = 1.12 - 0.8^2
s^2 = 1.12 - 0.64
s^2 = 0.48

SD = sqrt(s^2)
SD = sqrt(0.48)
SD = 0.69


2.

6/40 = 0.15

3.

61/100 = 0.61

4.

34/100 =0.34

SusanAthena, Master's Degree
Satisfied Customers: 4329
Experience: Tutor for Algebra, Geometry, Statistics. Explaining math in plain English.
SusanAthena and 2 other Calculus and Above Specialists are ready to help you
Customer: replied 2 years ago.
1. (TCO 7) Which of the following is the major anthropogenic source of excess carbon dioxide? (Points : 3)
Refrigerants, solvents, and fire retardants.
Microbial fermentation of organic matter in coal mines, oil well, and livestock.
Emissions from automobiles and chemical fertilizers.
Evaporation from the Earth['s oceans.
Combustion of fossil fuels and deforestation.

2. (TCO 7) Greenhouse gases, like carbon dioxide and methane, differ from atmospheric gases, like oxygen and nitrogen, in that (Points : 3)
greenhouse gases absorb and then reradiate infrared radiation towards the Earth's surface.
non-greenhouse gases reflect solar radiation.
greenhouse gases reflect solar radiation back into space.
greenhouse gases produce heat from chemical reactions.
non-greenhouse gases absorb greenhouse gases.

3. (TCO 7) The major anthropogenic source(s) of excess nitrous oxide in the atmosphere is/are (Points : 3)
refrigerants, solvents, and fire retardants.
microbial fermentation of organic matter in coal mines, oil well, and livestock.
oceans, agriculture, and biomass burning.
evaporation from the Earth's oceans.
combustion of fossil fuels.

4. (TCO 7) The day to day variations in temperature, air pressure, wind, humidity, and precipitation constitute an area's (Points : 3)
climate.
weather.
geography.
meteorology.
climate change.

5. (TCO 7) The major federal initiative aimed at controlling emissions is the (Points : 3)
Montreal Protocol.
National Ambient Air Quality Standards.
Global Climate Change Initiative.
Basel Convention.
Kyoto Protocol.

6. (TCO 8) The major source of sulfur dioxide emissions affecting the eastern United States and Canada has been identified as (Points : 3)
some 50 coal burning power plants.
some 50 nuclear power plants.
cars and trucks.
coming from the many auto and truck plants in the region.
hundreds of thousands of home coal burning stoves and furnaces.

7. (TCO 8) Acid precipitation is likely to have the greatest economic impact on humans through (Points : 3)
adverse health effects caused by direct contact.
adverse health effects caused by mobilization of toxic elements.
die offs of forests and aquatic ecosystems.
die offs of agricultural crops.
deterioration of building materials.

8. (TCO 8) Which of the following was TRUE of the ban on the use of lead in gasoline? (Points : 3)
Despite the ban, lead levels in the air did not change.
Lead was never a serious health or environmental hazard.
Lead could not be removed without major changes in automobile engines.
Once banned, lead levels quickly dropped in the population and the environment.
High lead levels were only a problem in Greenland.

9. (TCO 8) Pollutants capable of causing immediate life-threatening physiological illness are said to be (Points : 3)
chronic.
acute.
carcinogenic.
radioactive.
lethal.

10. (TCO 8) The brownish color of air in some polluted urban areas is due to (Points : 3)
nitrogen oxides producing photochemical smog.
sulfur oxides producing photochemical smog.
ozone depletion.
carbon dioxide.
soot from the industrial revolution.
Expert:  SusanAthena replied 2 years ago.
Hi. Thanks for requesting me. Since this is on a different topic, please post to a new question. I'm sorry to say that I can't assist, but perhaps another expert can.

Kind regards,
Susan
Customer: replied 2 years ago.
How many ways can an EMT union committee of 5 be chosen from 25 EMTs? (Points : 3)
100
125
15,504
53,130

Which of the following cannot be a probability? (Points : 3)
0.0031
-0.0031
3.1
neither b nor c


List the sample space for dealing only clubs from a deck of cards. (Points : 3)
{A, 1, 2, 3, 4, 5, 6, 7, 8, 9, J, Q, K}
{A, 2, 3, 4, 5, 6, 7, 8, 9, 10, J, Q, K}
{A, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, J, Q, K}
{ 1, 2, 3, 4, 5, 6, 7, 8, 9, J, Q, K}


What is the probability of choosing a queen on the 2nd draw if the first was a queen (without replacement)? (Points : 3)
0.077
0.041
0.059
0.023

A health class has 23 women and 18 men. If a student is chosen randomly to be the team leader, what is the probability the student is a woman? (Points : 3)
0.439
0.561
0.23
0.77




Compute the following: 4! ÷ (0! * 2!) (Points : 3)
12
24
2
0



Decide whether the experiment is a binomial, Poisson, or neither based on the information given. Each week a man plays a game in which he has a 21% chance of winning. The random variable is the number of times he wins in 64 weeks. (Points : 3)
binomial
Poisson
neither

Given a Poisson distribution with mean = 4. Find P(X > 3). (Points : 3)
0.195
0.238
0.433
0.567


Given the random variable X = {4, 5} with P(4) = 0.4 and P(5) = 0.6. Find E(X). (Points : 3)
1.6
4.6
2.4
3.0


(TCO 5) If X = {10, 20, 30, 40} and P(10) = 0.30, P(20) = 0.30, P(30) = 0.30, and P(40) = 0.30, can distribution of the random variable X be considered a probability distribution? (Points : 3)
yes
no

f X = {4, 6, 8, 11} and P(4) = 0.2, P(6) = 0.3, P(8) = 0.4, and P(11) = 0.1, can distribution of the random variable X be considered a probability distribution? (Points : 3)
yes
no

The number of shoes in your closet represents what kind of distribution? (Points : 3)
discrete
continuous

The number of brothers and sisters in your family represents what kind of distribution? (Points : 3)
discrete
continuous

The amount of posts in our class at a given time represents what kind of distribution? (Points : 3)
discrete
continuous
Customer: replied 2 years ago.
1.(TCO 5) We have a binomial experiment with p = 0.6 and n = 2.

(A) Set up the probability distribution by showing all x values and their associated probabilities.

(B) Compute the mean, variance, and standard deviation.


2. (TCO 4) What is the probability that the student carries a credit card given he's a sophomore?
Class Credit Card Carrier Not a Credit Card Carrier Total
Freshman 33 27 260
Sophomore 6 24 40
Total 39 61 100


3. Some students were asked if they carry a credit card. Here are the responses.
Class Credit Card Carrier Not a Credit Card Carrier Total
Freshman 33 27 60
Sophomore 6 24 40
Total 39 61 100

What is the probability that the student didn't carry a credit card?

4. (TCO 4) What is the probability that the student is a sophomore and doesn't carry a credit card?
Class Credit Card Carrier Not a Credit Card Carrier Total
Freshman 33 27 60
Sophomore 6 24 40
Total 39 61 100
Expert:  SusanAthena replied 2 years ago.
Hi. Thanks for your question.

Question 1 is different from before, because it has a different probability.

Questions 2 - 4 are the same. It looks like you made a slight error entering the table (24 instead of 34), but otherwise the data and questions are the same.

Do you just need question 1 answered?
Customer: replied 2 years ago.
The question is asking 24 this time, not 34, so would it be the same answers?
Expert:  SusanAthena replied 2 years ago.
Hi. The columns and rows have to add up, so I assumed that "34" was correct. 27 + 34 = 61 (column total); 6 + 34 = 40 (row total)

Please check the data again, thanks!
Customer: replied 2 years ago.
These are a different set of questions, the first set that i ask you was 34, now there are asking me 24 this time, i am kind of lost
Expert:  SusanAthena replied 2 years ago.
Hi. I see that they're different questions. Please check the data again. The row and columns MUST total up. The table as you've given it can't be correct. It says, for example, that there are 6 sophomores with credit cards and 24 without. That would make 30 total. But the total given is 40. The table just doesn't make sense.

Kind regards,
Susan
Customer: replied 2 years ago.
For number 2. i made a mistake on the Freshmen is should be 60 and not 260
Expert:  SusanAthena replied 2 years ago.
OK. I'm sorry to say that I won't be able to assist. The table doesn't make sense.

Kind regards,
Susan
Customer: replied 2 years ago.
Find the margin of error for the given values of c, s, and n.
C=0.90, s=3.9, n=49
E=_________
(Round to three decimal places as needed)

Construct the confidence interval for the population mean µ.
C= 0.95, x=8.1, s=0.3, and n=60
A 95% confidence interval for µ is _____, ______ (Round to two decimal places as needed.)

Construct the confidence interval for the population mean µ.
C= 0.95, x=16.5, s=6.0, and n=95
A 95% confidence interval for µ is _____, ______ (Round to two decimal places as needed.)
Use the confidence interval to find the estimated margin of error. Then find the sample mean.
A biologist reports a confidence interval of (2.5,3.3) when estimating the mean height in (in centimeters) of a sample of seedlings. The estimated margin of error is__________ , The sample mean is ________.

Find the minimum sample size n needed to estimate µ for the given values of c, s, and E.
C=0.98, s=6.6, and E=2
Assume that a preliminary sample has at least 30 members.
N=__________ (Round up to the nearest whole number)

You are given the sample mean and the sample standard deviation. Use this information to construct the 90% and 95% confidence intervals or the population mean. Interpret the results and compare the widths of the confidence intervals. If convenient, use technology to construct the confidence intervals.

A random sample of 45 home theater systems has a mean price of $145.00 and a standard deviation of $18.30

Construct a 90% confidence interval for the population mean.

The 90% confidence interval is (____,____).
(Round to two decimal places as needed.)

Construct a 95% confidence interval for the population mean.

The 95% confidence interval is (____,____).
(Round to two decimal places as needed.)


You are given the sample mean and the sample standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Which interval is wider? If the convenient, use technology to construct the confidence intervals.
A random sample of 49 gas grills has a mean price of $639.60 and a standard deviation of $57.40
The 90% confidence interval is ( _____,_____). (Round to two decimal places as needed.)
The 95% confidence interval is ( _____,_____). (Round to two decimal places as needed.)

You are given the sample mean and the sample standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Which interval is wider? If the convenient, use technology to construct the confidence intervals.

A random sample of 45 eight-ounce servings of different juice drinks has a mean of 77.3 calories and a standard deviation of 42.7 calories.

The 90% confidence interval is ( _____,_____). (Round to one decimal places as needed.)
The 95% confidence interval is ( _____,_____). (Round to two decimal places as needed.)

People were polled on how many book they read the previous year. How many subjects are needed to estimate the number of books read the previous year within one book with 95% confidence? Initial survey results indicate that σ=11.5 books.

A 95% confidence level requires ______ subjects.

(Round up to the nearest whole number as needed.)

A doctor wants to estimate the HDL cholesterol of all 20-to 29- year old females. How many subjects are needed to estimate the HDL cholesterol within 4 points with 99% confidence assuming σ = 17.2? Suppose the doctor would be content with 95% confidence. How does the decrease in confidence affect the sample size required?

A 99% confidence level requires ____ subjects.
(Round up to the nearest whole number as needed.)

A 95% confidence level requires ____ subjects
(Round up to the nearest whole number as needed.)

Construct the indicated confidence interval for the population mean µ using (a) a t-distribution. (b) If you had incorrectly used a normal distribution, which interval would be wider?
C= 0.95, x=14.3, s=3.0, n=7

The 95% confidence interval using a t-distribution is (____,_____).
(Round to one decimal place as needed.)

In the following situation, assume the random variable is normally distributed and use a normal distribution or a t-distribution to construct a 90% confidence interval for the population mean. If convenient, use technology to construct the confidence interval.

In a random sample of 10 adults from a nearby county, the mean waste generated
Per person per day was 3.95 pounds and the standard deviation was 1.38 pounds.
Repeat part (a), assuming the same statistics came from a sample size of 600. Compare the results.

For the sample of 10 adults, the 90% confidence intervals is (____,____).
(Round to two decimal places as needed.)

For the sample of 600 adults, the 90% confidence intervals is (____,____).
(Round to two decimal places as needed.)

15. Use the given confidence interval to find the margin of error and the sample proportion. (0.728,0.754)
E=_____ (Type an integer or a decimal)
P=_____(Type an integer or a decimal)

In a survey of 630 males ages 18-64, 391 say they have gone to the dentist in the past year.

Construct 90% and 95% confidence intervals for the population proportion. Interpret the
results and compare the widths of the confidence intervals. If convenient, use technology
to construct the confidence intervals.

The 90% confidence interval for the population proportion p is _____ , _____.
(Round the final answers to the nearest thousandth as needed. Round all intermediate values to the nearest thousandth as needed.)

The 95% confidence interval for the population proportion p is _____ , _____.
(Round the final answers to the nearest thousandth as needed. Round all intermediate values to the nearest thousandth as needed.)

17. In a survey of 9000 women, 6431 say they change their nail polish once a week. Construct a 99% confidence interval for the population proportion of women who change their nail polish once a week.
A 90% confidence interval for the population proportion is (____,_____).
(Round the final answers to the nearest thousandth as needed. Round all intermediate values to the nearest thousandth as needed.)
18. A researcher wishes to estimate, with 90% confidence, the proportion of adults who have high-speed Internet access. Her estimate must be accurate within 5% of the true proportion.
a) Find the minimum sample size needed, using a prior study that found that 34% of the respondents said they have high-speed Internet access.
b) No preliminary estimate is available. Find the minimum sample size needed.

a) What is the minimum sample size needed using a prior study that found that 34% of the respondents said they have high-speed Internet access?

N=_____(Round up to the nearest whole number as needed.)

b) What is the minimum sample size needed assuming that no preliminary estimate is available?

N=_____ (Round up to the nearest whole number as needed.)

19. The table to the right shows the results of a survey in which 2600 adults from Country A, 1135 adults from Country B, and 1052 adults from Country C were asked if human activity contributes to global warming. Complete parts (a), (b) (c).
(a) Construct a 99% confidence interval for the proportion of adults from Country A who say human activity contributes to global warming.
(___,_____) (Round to three decimal places as needed.)
(b) Construct a 99% confidence interval for the proportion of adults from Country B who say human activity contributes to global warming.
(___,_____) (Round to three decimal places as needed.)
(c) Construct a 99% confidence interval for the proportion of adults from Country C who say human activity contributes to global warming.
(___,_____) (Round to three decimal places as needed.)


Adults who say that human activity contributes to global warming
Country A-62%
Country B-86%
Country C-93%

20. The table shows the results of a survey in which separate samples of 400 adults each from the East, South, Midwest, and West were asked if traffic congestion is a serious problem in their community. Complete parts (a) and (b)
(a)Construct a 95% confidence interval for the proportion of adults from the West who say traffic congestion is a serious problem.
The 95% confidence interval for the proportion of adults from the East who say traffic congestion is a serious problem is (___,___) (Round to three decimal places as needed.)


(b) Construct a 95% confidence interval for the proportion of adults from the South who say traffic congestion is a serious problem.
The 95% confidence interval for the proportion of adults from the South who say traffic congestion is a serious problem is (___,___) (Round to three decimal places as needed.)

East: 35%
South:33%
Midwest:25%
West:55%
Expert:  SusanAthena replied 2 years ago.
Hi. Thank you for requesting me.

Please post your new questions to a new question, thank you!
Customer: replied 2 years ago.
Hello i may not under stand what you are saying

What do you mean post your new questions to a new question?
Expert:  SusanAthena replied 2 years ago.
Hi. Please start a new thread rather than posting back here, thank you!

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