How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Ryan Your Own Question

Ryan
Ryan, Engineer
Category: Calculus and Above
Satisfied Customers: 8941
Experience:  B.S. in Civil Engineering
40260889
Type Your Calculus and Above Question Here...
Ryan is online now
A new question is answered every 9 seconds

I need help with a multiple choice test, it consists of

Customer Question

I need help with a multiple choice test, it consists of around 80 multiple choice questions is about statistics.
Submitted: 9 months ago.
Category: Calculus and Above
Expert:  Ryan replied 9 months ago.
Hi, Thank you for using the site. I'll be happy to take a look at the questions. Please post them at your convenience. Thanks, Ryan
Customer: replied 9 months ago.
Hi Ryan,
I will have a time limit to complete the test, and once I start I have to finish Im really depending on this service.
Customer: replied 9 months ago.
Are you ok with that??
Expert:  Ryan replied 9 months ago.
Oh, ok. Well that's not too unusual, but it changes things a little bit. Before anybody commits to anything, can you give me a little more information about what this might entail? How much time do you have to complete it? What course material do you expect to be covered?
Customer: replied 9 months ago.
The material is on Statistics, and it has four parts 20 questions each part and I have 3 hours to complete each part. Its that time enough for you.
Expert:  Ryan replied 9 months ago.
Is this basic introductory statistics?
Customer: replied 9 months ago.
I can take a break between parts You just tell me and I will stop after a part, but once I start a part I have 3 hours to complete it. This is Intermediate Statistics.
Expert:  Ryan replied 9 months ago.
Do you recall what the last topic covered was? I'm trying to get some kind of feel for what portion of the whole statistics spectrum might be in play. And it wouldn't be a good thing for you if we were to find out too late that this includes material that I'm not familiar with.
Expert:  Ryan replied 9 months ago.
Also, other than the actual limit for each section, is there a deadline for when you need to have all four parts completed? A 12-hour stretch to do this all in one shot might be a bit unreasonable.
Customer: replied 9 months ago.
I understand, I have two days to complete it. If we could do two parts today and two tomorrow...
Expert:  Ryan replied 9 months ago.
Let's do the first one and see how it goes. If it's not too time consuming, perhaps we can get more than two done today.
Customer: replied 9 months ago.
ok give me a second...
Expert:  Ryan replied 9 months ago.
ok
Customer: replied 9 months ago.
Question 1Assume that you are using a significance level of α = 0.05 to test the claim that p1 = p2. Use the given sample sizes and the number of hits to find the z test statistic for hypothesis testing. A report on the nightly news program said that 10 108 households with dogs were stolen and 20 208 without dogs were stolen.A) z = -0041B) z = -0.102C) z = 0.000D) z = -0173
Expert:  Ryan replied 9 months ago.
B. z = -0.102 Note: Be careful about copying and pasting information. Sometimes parts of the problem statement are not text, and they tend to disappear. The "10 108 households" part looks odd, but I was able to figure out what it meant. If you can take screenshots and post those, issues like this might be avoided.
Customer: replied 9 months ago.
Did you received the example pic I send before???
Expert:  Ryan replied 9 months ago.
I haven't received any images during our conversation today.
Customer: replied 9 months ago.
2. Build confidence interval indicated by the difference between the two population means. Suppose that the two samples are independent simple random samples selected from populations with normal distribution. Do not assume that the population standard deviations are equal. A researcher was interested in comparing the resting pulse rate of people who exercise regularly and pulse rates of people who do not exercise regularly. She obtained independent simple random samples of 16 people who do not exercise regularly and 12 people who exercise regularly. Pulse rates at rest (beats per minute) were recorded and summary statistics are as follows."DO NOT EXERCISE
REGULARLY
_X1 = 72.3 BEATS / MIN
S1 = 10.9 BEATS / MIN
N1 = 16Exercise regularly
_X2 = 68.1 BEATS / MIN
S2 = 8.2 BEATS / MIN
N2 = 12
Construct a confidence interval of 95% for μ1 - μ2, the difference between the average pulse frequency of people who do not exercise regularly and pulse frequency of average people who exercise regularly.-3.22 Beats / min <μ1 - μ2 <11.62 beats / min-3.55 Beats / min <μ1 - μ2 <11.95 beats / min-3.74 Beats / min <μ1 - μ2 <12.14 beats / min-4.12 Beats / min <μ1 - μ2 <14.72 beats / min
Expert:  Ryan replied 9 months ago.
Choice A: -3.22 Beats / min <&mu;1 - &mu;2 <11.62 beats / min
Customer: replied 9 months ago.
Suppose the data are normally distributed and the number of observations is greater than fifty. Find the critical value z used to test the null hypothesis. α = 0.05 for a two-tailed test.A) ± 1.96B) -1.96C) ± 1.64D) 1.96
Expert:  Ryan replied 9 months ago.
A) &plusmn; 1.96
Customer: replied 9 months ago.
Use the given data to find the equation of the regression line. Rounding the final values to three significant digits, if necessary.X 1 3 5 7 9
Y 143 116 100 98 90A) Y = -150.7 + 6.8xB) Y = 150.7 - 6.8xC) Y = 140.4 - 6.2xD) Y = -140.4 + 6.2x
Expert:  Ryan replied 9 months ago.
C) Y = 140.4 - 6.2x
Customer: replied 9 months ago.
Use a computer program to find the multiple regression equation. Can the equation be used for prediction? An anti-snuff group used the data in the table to link carbon monoxide various brands of cigarettes and their contentART CO NIC
15 1.2 16
15 1.2 16
17 1.0 16
6 0.8 9
1 0.1 1
8 0.8 8
10 0.8 10
17 1.0 16
15 1.2 15
11 0.7 9
18 1.4 18
16 1.0 15
10 0.8 9
7 0.5 5
18 1.1 16
CO = carbon monoxide
TAR = tar
NIC = nicotinea) CO = 1.37 - 5.53TAR + 133NIC; Yes, because the R2 is high
b) CO = 1.37 + 5.50TAR - 138NIC; Yes, because the p value is high
c) CO = 1.3 + 5.5TAR - 1.3NIC; Yes, because the R2 is low
d) CO = 1.25 + 1.55TAR - 5.79NIC; Yes because the p is low
Customer: replied 9 months ago.
Find the unexplained variation to the data below. Paired data show test scores and hours of preparation for 5 students randomly selected. The equation of the regression line is = 44.8447 + 3.52427 x. Find the variation does not explcada. x hours of preparation | 2 May 9 June 10 ____________________ | _______________________ | and test scores | 64 48 72 73 80A) 511 724B) 87.4757C) 599.2D) 96 103
Expert:  Ryan replied 9 months ago.
Going back to the one about the cigarettes, can you double-check the column headings? I'm not getting any of the given answer choices for the regression equation. I suspect that maybe the column labels are in the wrong order.
Customer: replied 9 months ago.
7. Find standard error of the estimate for the data below. Build the prediction interval for an individual and indicated. Paired data show test scores and hours of preparation for 5 students randomly selected. The equation of the regression line is = 44.8447 + 3.52427 x and standard error of estimate is SE = 5.40. Find the prediction interval 99% for test score of a person who spent 7 hours preparing for the exam. x hours of preparation | 2 May 9 June 10 ____________________ | _______________________ | and test scores | 64 48 72 73 80A) 58 <y <82B) 62 <y <78C) 35 <y <104D) 32 <y <104
Expert:  Ryan replied 9 months ago.
For the "test scores" problem, it seems like there is missing data, or mangled data. What do "May" and "June" have to do with this problem? It seems that there should be a set of study times, and a set of test scores. Can you please clarify?
Customer: replied 9 months ago.
Find standard error of the estimate for the data below. Build the prediction interval for an individual and indicated. Paired data show test scores and hours of preparation for 5 students randomly selected. The equation of the regression line is Y = 44.8447 + 3.52427 x and standard error of estimate is SE = 5.40. Find the prediction interval 99% for test score of a person who spent 7 hours preparing for the exam. x hours of preparation 5 2 9 6 10 ____________________ | _______________________ | and test scores | 64 48 72 73 80A) 58 <y <82B) 62 <y <78C) 35 <y <104D) 32 <y <104
Customer: replied 9 months ago.
There I fixed it...
Expert:  Ryan replied 9 months ago.
Do those same numbers go with the one about the unexplained variation? (I suspect that they do, but I don't want to assume anything.)
Customer: replied 9 months ago.
the other one for the cigarette
CO TAR NIC
15 1.2 16
15 1.2 16
17 1.0 16
6 0.8 9
1 0.1 1
8 0.8 8
10 0.8 10
17 1.0 16
15 1.2 15
11 0.7 9
18 1.4 18
16 1.0 15
10 0.8 9
7 0.5 5
18 1.1 16
Customer: replied 9 months ago.
It comes out like that
15 1.2 16
Customer: replied 9 months ago.
try your best...
Customer: replied 9 months ago.
Use the information given to calculate the coefficient of determination. A regression equation is obtained for a set of paired data. It was found that the total variation is 24.488, explained variation is 15,405, and the unexplained variation is 9,083. Calculate the coefficient of determinationA) 0629B) 0590C) 1590D) 0.371
Customer: replied 9 months ago.
9.Dados the linear correlation coefficient r and the sample size n, determine the críiticos r values and use them to establish whether the given r represents a significant or linear correlation. Use a significance level of 0.05. r = 0.75, n = 9A) Critical values: r = ± 0.666, there is a significant linear correlationB) Critical values: r = 0.666, there is a significant linear correlationC) Critical values: r = - 0.666, there is a significant linear correlationD) Critical values: r = ± 0.666, significant correlation Linal
Customer: replied 9 months ago.
Use the given data to find the best predicted value of the response variable. Six pairs of data gives r = 0.789 and the regression equation What is the best predicted for x = 5 value?A) 22.0B) 18.0C) 18.5D) 19.0
Expert:  Ryan replied 9 months ago.
The data itself was fine, it was the headings that were wrong. For the cigarette question, the solution is a) CO = 1.37 - 5.53TAR + 133NIC; Yes, because the R2 is high For the one about unexplained variation, the solution is B) 87.4757 For the one about the 99% predication interval, the answer choices are not intervals. Is there something wrong there? For the one about the coefficient of determination, the solution is A) 0.629 For the one about the linear correlation coefficient, the solution is A) Critical values: r = &plusmn; 0.666, there is a significant linear correlation For the last one, what is the regression equation?
Customer: replied 9 months ago.
Y =4x - 2 also, -y = 19.0
Expert:  Ryan replied 9 months ago.
Thanks. For that one, the solution is D) 19.0
Customer: replied 9 months ago.
Find standard error of the estimate for the data below. Build the prediction interval for an individual and indicated. Paired data show test scores and hours of preparation for 5 students randomly selected. The equation of the regression line is Y = 44.8447 + 3.52427 x and standard error of estimate is SE = 5.40. Find the prediction interval 99% for test score of a person who spent 7 hours preparing for the exam. x hours of preparation 5 2 9 6 10 ____________________ | _______________________ | and test scores | 64 48 72 73 80A) 58 <y <82B) 62 <y <78C) 35 <y <104D) 32 <y <104
Expert:  Ryan replied 9 months ago.
I don't know what to do with that one. It seems to be asking for the standard error of the estimate, and then it gives a value of 5.40, which then doesn't match with any of the answer choices. And then it also asks for a prediction interval, but the answer choices are not in the form of intervals.
Customer: replied 9 months ago.
Find standard error of the estimate for the data below. Paired data show test scores and hours of preparation for 5 students randomly selected. The equation of the regression line is Y = 44.8447 + 3.52427 x. Find standard error of the estimate. x hours of preparation X 5 2 9 6 10 ____________________ | _______________________ | Y 64 48 72 73 80A) 4.1097B) 7.1720C) 5.3999D) 13 060
Expert:  Ryan replied 9 months ago.
C) 5.3999
Customer: replied 9 months ago.
Sorry the answers for those is.A) 58 < y < 82B) 62 < y < 78
C) 35 < y < 104
D) 32 < y < 104
Expert:  Ryan replied 9 months ago.
Thanks. C) 35 < y < 104
Customer: replied 9 months ago.
Find the total variation for the data below. Paired data show test scores and hours of preparation for 5 students randomly selected. The equation of the regression line is Y = 44.8447 + 3.52427 x. Find the total variation. x hours of preparation
X 5 2 9 6 10_________________ | _______________________ | and test scores Y 64 48 72 73 80A) 599.2B) 498 103C) 511,724D) 87.4757
Customer: replied 9 months ago.
Find the variance explained for the following data. Paired data show test scores and hours of preparation for 5 students randomly selected. The equation of the regression line is = 44.8447 + 3.52427 x. Find the explcada variation. x hours of preparation X 5 2 9 6 10____________________ | _______________________ | and test scores Y 64 48 72 73 80A) 498 103B) 511 724C) 87.4757D) 599.2
Customer: replied 9 months ago.
Use a computer program to obtain multiple regression equation. Use the estimated equation to find the predicted value. A health specialist collected the data in the table to see if the pulses can be explained by exercise and smoking. For exercise, he assigned 1 to if and 2 to no. For smoking, if assigned 1 to 2 to no. Then use the results to predict the pulse rate of a person whose value was 1 year and whose value was smoking PULSO EXERCISE 1. SMOKING97 2 2
88 1 2
69 1 2
67 1 2
83 1 2
77 1 2
66 2 2
78 2 2
73 1 1
67 1 1
55 1 2
82 1 1
70 1 2
55 1 2
76 1 2A) 70 beats / minB) 74 beats / minC) 81 beats / minD) 77 beats / min
Expert:  Ryan replied 9 months ago.
For the total variation question, the solution is A) 599.2 For the explained variation question, the solution is B) 511 724
Expert:  Ryan replied 9 months ago.
B) 74 beats / min
Customer: replied 9 months ago.
Use a computer program to find the multiple regression equation, R2, R2 and p-value adjusted. An anti-snuff group used the data in the table to link carbon monoxide various brands of cigarettes and content of tar and nicotine. Note: CO = carbon monoxide TAR = tar NIC = nicotine
CO TAR NIC
15 1.2 16
15 1.2 16
17 1.0 16
6 0.8 9
1 0.1 1
8 0.8 8
10 0.8 10
17 0.1 16
15 1.2 15
11 0.7 9
18 1.4 18
16 1.0 1.5
10 0.8 9
7 0.5 5
18 1.1 16A) 0976, 0921, 0002B) 0.943, 0.934, 0.000C) 0.931, 0.902, 0.000D) 0861, 0900, 0015
Expert:  Ryan replied 9 months ago.
B) 0.943, 0.934, 0.000
Customer: replied 9 months ago.
Use the results shown to answer the question. A collection of data pairs is the number of years students have studied Spanish and their scores on a test of Spanish language skills. a computer program was used to obtain the linear least squares regression, and computer output shown below. Along with the data of paired samples, the program also gave a value x 2 (years of study) to be used to predict the test score.The regression equation isScore = 31.55 + 10.9 yearsPredictor Coef. T PConstant 31.55 6.36 4.96 0,00010.90 1,744 6.25 0,000 yearsS = 5,651 R2 R2 = 83.0% (Adjusted) = 82.7%predicted valuesEst IP 95% 95%3,168 53.35 (42.72, 63.98) (31.61,75.09)SD: standard deviationWhat percent of the total variation in test scores can be explained by the linear relationship between the years of study and test scores?A) 82.7%B) 17.0%C) 91.1%D) 83.0%
Expert:  Ryan replied 9 months ago.
D) 83.0%
Customer: replied 9 months ago.
Ok that will be all for today, tomorrow we take the last two parts.
Expert:  Ryan replied 9 months ago.
Ok. Have a good night.
Customer: replied 9 months ago.
That was part one and two today.

Related Calculus and Above Questions