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Scott
Scott, MIT Graduate
Category: Homework
Satisfied Customers: 17710
Experience:  MIT Graduate (Math, Programming, Science, and Music)
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scott i need ur help

Customer Question

multiple choice questions has to do with statistics
Submitted: 6 years ago.
Category: Homework
Expert:  Scott replied 6 years ago.

Hi there!

What are the questions?

-Scott

Customer: replied 6 years ago.
it is like a timed exam and once i open up the page i have to answer the questions with 30 mins thats y i wanted to check wit u first..just like we did the last time
Expert:  Scott replied 6 years ago.

Can you do it later today? Or do you have to do it right now?

-Scott

Customer: replied 6 years ago.
yes i can...wot time are u goin to be online???
Expert:  Scott replied 6 years ago.

Why don't you write back sometime this evening, after 8 or so. That way if I can't help, there will be many other experts online.

I'm pretty busy now.

-Scott

Customer: replied 6 years ago.
okay then..thanks
Customer: replied 6 years ago.
hi scott...do u think u can help me now
Expert:  Scott replied 6 years ago.

You can post what you have, but since I haven't seen it I can't guarantee that I'll know it. What exact topic is it going to be about?

-Scott

Customer: replied 6 years ago.
statistis.,discrete prob distribution,normal prob distributions and confidence intervals
Expert:  Scott replied 6 years ago.

Ok, well you can post it.

I'm just worried that if I can't do it, for some reason, that you will be out of luck.

-Scott

Customer: replied 6 years ago.
ok..i am posting it..pls lemme kno if u cnt cos i have 30mins to finish up
Customer: replied 6 years ago.
.

In a random sample of 60 computers, the mean repair cost was $150 with a standard deviation of $36. Construct a 99% confidence interval for the population mean.



a. ($138, $162)

b. ($18, $54)

c. ($537, $654)

d. ($238, $274)


Save Answer   

2. ES3L 4.1-20 (Points: 1)    
Solve the problem.

Determine the probability distribution's missing value.
The probability that a tutor will see 0, 1, 2, 3, or 4 students





a. -0.29

b. 0.95

c. 0.24

d. 0.76


Save Answer   

3. ES3L 6.2-6 (Points: 1)    
Solve the problem.

Find the value of E, the margin of error, for c = 0.99, n = 15 and s = 5.7.



a. 1.13

b. 4.38

c. 3.86

d. 4.49


Save Answer   

4. ES3L 4.3-4 (Points: 1)    
Solve the problem.

A statistics professor finds that when he schedules an office hour at the 10:30 a.m. time slot, an average of three students arrives. Use the Poisson distribution to find the probability that in a randomly selected office hour no students will arrive.



a. 0.0498

b. 0.1108

c. 0.1225

d. 0.0743


Save Answer   

5. ES3L 5.1-2 (Points: 1)    
Solve the problem.

Find the area under the standard normal curve to the right of z = 1.



a. 0.1397

b. 0.1587

c. 0.5398

d. 0.8413


Save Answer   

6. ES3L 6.2-22 (Points: 1)    
Solve the problem.

The grade point averages for 10 randomly selected high school students are listed below. Assume the grade point averages are normally distributed.

2.0 3.2 1.8 2.9 0.9 4.0 3.3 2.9 3.6 0.8

Find a 98% confidence interval for the true mean.



a. (2.12, 3.14)

b. (3.11, 4.35)

c. (0.67, 1.81)

d. (1.55, 3.53)


Save Answer   

7. ES3L 4.1-23 (Points: 1)    
Solve the problem.

The random variable x represents the number of boys in a family of three children. Assuming that boys and girls are equally likely, find the mean and standard deviation for the random variable x.



a. mean: 1.50; standard deviation: 0.87

b. mean: 2.25; standard deviation: 0.76

c. mean: 1.50; standard deviation: 0.76

d. mean: 2.25; standard deviation: 0.87


Save Answer   

8. ES3L 6.2-13 (Points: 1)    
Solve the problem.

Construct a 95% confidence interval for the population mean, µ. Assume the population has a normal distribution. A sample of 25 randomly selected students has a mean test score of 81.5 with a standard deviation of 10.2.



a. (66.35, 69.89)

b. (87.12, 98.32)

c. (77.29, 85.71)

d. (56.12, 78.34)


Save Answer   

9. ES3L 4.1-2 (Points: 1)    
Solve the problem.

State whether the variable is discrete or continuous.
The height of a player on a basketball team



a. discrete

b. continuous


Save Answer   

10. ES3L 4.1-3 (Points: 1)    
Solve the problem.

State whether the variable is discrete or continuous.
The cost of a Statistics textbook



a. continuous

b. discrete
Customer: replied 6 years ago.
for #2 x 0 1 2 3 4
       p(x)0.01 0.04 0.37 0.34 ?
Customer: replied 6 years ago.
so do u think u kno it??
Expert:  Scott replied 6 years ago.

We need more info for #2. Here are the ones I am sure of. Please give me info for #2, and possibly post the other ones in a new thread.

-Scott

In a random sample of 60 computers, the mean repair cost was $150 with a standard deviation of $36. Construct a 99% confidence interval for the population mean.

150-2.58*36/sqrt(60) to 150 +2.58*36/sqrt(60)

a. ($138, $162)

b. ($18, $54)

c. ($537, $654)

d. ($238, $274)


Save Answer

2. ES3L 4.1-20 (Points: 1)
Solve the problem.

Determine the probability distribution's missing value.
The probability that a tutor will see 0, 1, 2, 3, or 4 students



a. -0.29

b. 0.95

c. 0.24

d. 0.76




5. ES3L 5.1-2 (Points: 1)
Solve the problem.

Find the area under the standard normal curve to the right of z = 1.



a. 0.1397

b. 0.1587

c. 0.5398

d. 0.8413





Save Answer

9. ES3L 4.1-2 (Points: 1)
Solve the problem.

State whether the variable is discrete or continuous.
The height of a player on a basketball team



a. discrete

b. continuous


Save Answer

10. ES3L 4.1-3 (Points: 1)
Solve the problem.

State whether the variable is discrete or continuous.
The cost of a Statistics textbook



a. continuous

b. discrete

Expert:  Scott replied 6 years ago.

Here is 2:

1 - 0.01 -0.04- 0.37 -0.34

0.24

-Scott

Customer: replied 6 years ago.
r u still wrking on the rest
Expert:  Scott replied 6 years ago.

I'd rather not give you the wrong answers, so can you post the others in a new thread?

-Scott

Customer: replied 6 years ago.
i still need ur help though
Customer: replied 6 years ago.
u there?
Expert:  Scott replied 6 years ago.

Oh, I had opted out so that other experts can try to answer these.

-Scott

Customer: replied 6 years ago.
i still want ur help even if u can do all of them....this is another question though
Expert:  Scott replied 6 years ago.

There are new questions? Are they going to be similar to these? If so, I might not be able to do them all...

-Scott

Customer: replied 6 years ago.
thats fine just try.....thanks
Customer: replied 6 years ago.
Solve the problem.

Find the area under the standard normal curve between z = 0 and z = 3.



a. 0.9987

b. 0.0010

c. 0.4987

d. 0.4641


Save Answer   

2. ES3L 5.1-22 (Points: 1)    
Solve the problem.

Find the area of the indicated region under the standard normal curve.






a. 0.1292

b. 0.1504

c. 0.8489

d. 0.0212


Save Answer   

3. ES3L 6.1-10 (Points: 1)    
Solve the problem.

A random sample of 40 students has a mean annual earnings of $3120 and a standard deviation of $677. Find the margin of error if c = 0.95.



a. $210

b. $77

c. $2891

d. $7


Save Answer   

4. ES3L 5.3-10 (Points: 1)    
Solve the problem.

For the standard normal curve, find the z-score that corresponds to the 7th decile.



a. 0.12

b. 0.53

c. 0.47

d. 0.98


Save Answer   

5. ES3L 4.1-6 (Points: 1)    
Solve the problem.

State whether the variable is discrete or continuous.
The number of goals scored in a soccer game



a. continuous

b. discrete


Save Answer   

6. ES3L 4.2-25 (Points: 1)    
Solve the problem.

The probability that a tennis set will go to a tie-breaker is 20%. What is the probability that two of three sets will go to tie-breakers?



a. 0.384

b. 0.04

c. 0.096

d. 0.2


Save Answer   

7. ES3L 6.1-6 (Points: 1)    
Solve the problem.

Find the critical value zc that corresponds to a 95% confidence level.



a. ±1.96

b. ±2.575

c. ±1.645

d. ±2.33


Save Answer   

8. ES3L 5.3-21 (Points: 1)    
Solve the problem.

Compare the scores: a score of 220 on a test with a mean of 200 and a standard deviation of 21 and a score of 90 on a test with a mean of 80 and a standard deviation of 8.



a. A score of 90 with a mean of 80 and a standard deviation of 8 is better.

b. You cannot determine which score is better from the given information.

c. A score of 220 with a mean of 200 and a standard deviation of 21 is better.

d. The two scores are statistically the same.


Save Answer   

9. ES3L 5.3-11 (Points: 1)    
Solve the problem.

Find the z-scores for which 90% of the distribution's area lies between -z and z.



a. (-1.645, 1.645)

b. (-2.33, 2.33)

c. (-1.96, 1.96)

d. (-0.99, 0.99)


Save Answer   

10. ES3L 5.3-32 (Points: 1)    
Solve the problem.

In a certain normal distribution, find the standard deviation s when µ = 50 and 10.56% of the area lies to the right of 55.



a. 4

b. 5

c. 3

d. 2
Customer: replied 6 years ago.
i have 30 minutes
Expert:  Scott replied 6 years ago.

Here are the ones I can help with! I need more info on #2.

-Scott

Solve the problem.

Find the area under the standard normal curve between z = 0 and z = 3.



a. 0.9987

b. 0.0010

c. 0.4987

d. 0.4641


Save Answer

2. ES3L 5.1-22 (Points: 1)
Solve the problem.

Find the area of the indicated region under the standard normal curve.

Need more info




a. 0.1292

b. 0.1504

c. 0.8489

d. 0.0212


Save Answer

3. ES3L 6.1-10 (Points: 1)
Solve the problem.

A random sample of 40 students has a mean annual earnings of $3120 and a standard deviation of $677. Find the margin of error if c = 0.95.

677*1.96/sqrt(40)

a. $210

b. $77

c. $2891

d. $7


Save Answer

4. ES3L 5.3-10 (Points: 1)
Solve the problem.

For the standard normal curve, find the z-score that corresponds to the 7th decile.



a. 0.12

b. 0.53

c. 0.47

d. 0.98


Save Answer

5. ES3L 4.1-6 (Points: 1)
Solve the problem.

State whether the variable is discrete or continuous.
The number of goals scored in a soccer game



a. continuous

b. discrete


Save Answer

6. ES3L 4.2-25 (Points: 1)
Solve the problem.

The probability that a tennis set will go to a tie-breaker is 20%. What is the probability that two of three sets will go to tie-breakers?

3*0.2^2*0.8

a. 0.384

b. 0.04

c. 0.096

d. 0.2


Save Answer

7. ES3L 6.1-6 (Points: 1)
Solve the problem.

Find the critical value zc that corresponds to a 95% confidence level.



a. ±1.96

b. ±2.575

c. ±1.645

d. ±2.33


Save Answer

9. ES3L 5.3-11 (Points: 1)
Solve the problem.

Find the z-scores for which 90% of the distribution's area lies between -z and z.



a. (-1.645, 1.645)

b. (-2.33, 2.33)

c. (-1.96, 1.96)

d. (-0.99, 0.99)


Save Answer

10. ES3L 5.3-32 (Points: 1)
Solve the problem.

In a certain normal distribution, find the standard deviation s when µ = 50 and 10.56% of the area lies to the right of 55.



a. 4

b. 5

c. 3

d. 2

Customer: replied 6 years ago.
8. ES3L 5.3-21 (Points: 1)    
Solve the problem.

Compare the scores: a score of 220 on a test with a mean of 200 and a standard deviation of 21 and a score of 90 on a test with a mean of 80 and a standard deviation of 8.



a. A score of 90 with a mean of 80 and a standard deviation of 8 is better.

b. You cannot determine which score is better from the given information.

c. A score of 220 with a mean of 200 and a standard deviation of 21 is better.
d. The two scores are statistically the same
Expert:  Scott replied 6 years ago.

Please give me more information about problem #2.

-Scott

Customer: replied 6 years ago.
I CANT ITS A GRAPH AND I CAN PAST IT
Customer: replied 6 years ago.
U THERE?
Expert:  Scott replied 6 years ago.

I'm not sure about 8, and I need that figure for #2.

-Scott

Customer: replied 6 years ago.
ITS A STANdard normal curve
-1.13          0           2.03
Expert:  Scott replied 6 years ago.

Ok, the area between -1.13 and 2.03 is:

0.849

But without seeing the graph, I can't be positive that is what you are looking for.

-Scott

Customer: replied 6 years ago.
thanks....thats what i got
Customer: replied 6 years ago.
thats...i'll accept it...thanks alot
Expert:  Scott replied 6 years ago.
THIS ANSWER IS LOCKED!
You can view this answer by clicking here to Register or Login and paying $3.
If you've already paid for this answer, simply Login.
Scott, MIT Graduate
Category: Homework
Satisfied Customers: 17710
Experience: MIT Graduate (Math, Programming, Science, and Music)
Scott and 2 other Homework Specialists are ready to help you
Customer: replied 6 years ago.
r u there scott...i need some help
Expert:  Scott replied 6 years ago.
I am here. What type of help do you need?
-Scott
Customer: replied 6 years ago.
statistics
Expert:  Scott replied 6 years ago.
Why don't you post the questions in a new thread, and I'll answer if I can, and leave them for another expert if I can't.

-Scott
Customer: replied 6 years ago.
how do i start a new thread
Expert:  Scott replied 6 years ago.
Just post it as a new question.
-Scott
Customer: replied 6 years ago.
scott...can u see the questions i posted do u think u can answer them?....i only hvae about 20minutes left
Expert:  Scott replied 6 years ago.
Hi,

There's no way I'd be able to do them so quickly. Sorry about that.

-Scott
Customer: replied 6 years ago.
just do what u can do....please
Customer: replied 6 years ago.
i have 2 hours to do it

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