1. Identify the null hypothesis Ho and the alternative hypothesis H1. Carter Motor Company claims that its new sedan, the Libra, will average better than 21 miles per gallon in the city. Use μ, the true average mileage of the Libra.

Ho: μ = 21, H1: μ> 21

Ho: μ > 21, H1: μ= 21

Ho: μ = 21, H1: μ< 21

Ho: μ < 21, H1: μ = 21 (Points : 7)

Please refer to answer choice a. above. Please refer to answer choice b. above. Please refer to answer choice c. above. Please refer to answer choice d. above.

2. Identify the null hypothesis Ho and the alternative hypothesis H1. The manufacturer of a refrigerator system for beer kegs produces refrigerators that are supposed to maintain a true mean temperature, µ, of 46 degree F, ideal for a certain type of German pilsner. The owner of the brewery does not agree with the refrigerator manufacturer, and claims he can prove that the true mean temperature is incorrect.

Ho: µ 46 degree, H1: µ= 46 degree

Ho: µ = 46 degree, H1: µ 46 degree

Ho: µ 46 degree, H1: µ> 46 degree

Ho: µ 46 degree, H1: µ < 46 degree

(Points : 7)

Please refer to answer choice a. above. Please refer to answer choice b. above. Please refer to answer choice c. above. Please refer to answer choice d. above.

3. Assume that the data has a normal distribution. Also assume that the standard deviation of the population, sigma, is known. Find the critical value(s) used to test a null hypothesis: level of significance = 0.1 for a two-tailed test. (Points : 6)

2.33 2.05 1.48 1.645

4. Assume that the data has a normal distribution. Also assume that the standard deviation of the population, sigma, is known. Find the critical value(s) used to test a null hypothesis: level of significance = 0.07; H1 is μ > 62.4. (Points : 6)

1.48 1.81 1.81 -1.48

5. A skeptical paranormal researcher claims that the proportion of Americans that have seen a UFO, p, is less than 2 in every ten thousand. Assuming that a hypothesis test of the claim has been conducted and that the conclusion is failure to reject the null hypothesis, state the conclusion in nontechnical terms. Be sure to address the original claim. (Points : 7)

There is sufficient evidence to support the claim that the true proportion is greater than 2 in ten thousand. There is sufficient evidence to support the claim that the true proportion is less than 2 in ten thousand. There is not sufficient evidence to support the claim that the true proportion is less than 2 in ten thousand. There is not sufficient evidence to support the claim that the true proportion is greater than 2 in ten thousand.

6. A psychologist claims that more than 32 percent of the population suffers from professional problems due to extreme shyness. Assuming that a hypothesis test of the claim has been conducted and that the conclusion is failure to reject the null hypothesis, state the conclusion in nontechnical terms. (Points : 7)

There is not sufficient evidence to support the claim that the true proportion is less than 32 percent. There is sufficient evidence to support the claim that the true proportion is greater than 32 percent. There is not sufficient evidence to support the claim that the true proportion is greater than 32 percent. There is sufficient evidence to support the claim that the true proportion is less than 32 percent.

7. Suppose you wish to test the claim that μ = 3.45. Given a sample of n = 32 and a significance level of = 0.01, what criterion would be used for rejecting the null hypothesis? Assume that the standard deviation, σ, of the population is known. (Points : 6)

Reject Ho if test statistic > 2.33 or < -2.33. Reject Ho if test statistic > 2.575. Reject Ho if test statistic > 2.575 or < -2.575. Reject Ho if test statistic > 2.33.

8. Suppose you wish to test the claim that μ > 10. Given a sample of n = 50 and a significance level of = 0.10, what criterion would be used for rejecting the null hypothesis? Assume that the standard deviation, σ, of the population is known. (Points : 6)

Reject Ho if test statistic > 1.645 or < -1.645. Reject Ho if test statistic > 1.645. Reject Ho if test statistic > 1.28. Reject Ho if test statistic < 1.28.

9. Suppose you wish to test the claim that μ < 62.2. Given a sample of n = 106 and a significance level of = 0.01, what criterion would be used for rejecting the null hypothesis? Assume that the standard deviation, σ, of the population is known. (Points : 6)

Reject Ho if test statistic < -2.33. Reject Ho if test statistic < -2.575. Reject Ho if test statistic < 2.575. Reject Ho if test statistic > -2.33.

10. A population is normally distributed with a standard deviation σ = 26. We wish to test the hypotheses Ho: μ = 942.1; H1 = μ > 942.1. A 70-item sample has a mean = 905.7. Compute the value of the test statistic. (Points : 7)

-11.71 -0.17 -13.52 594.61

11. Find the critical value or values for the given hypothesis, sample size, and significance level. Assume that the standard deviation of the population, σ, is unknown. H1: μ < 1.04, n = 18, = 0.05. (Points : 7)

1.740 -1.740 -1.734 2.110

12. for a data set is 3.36, s is 0.376 and n = 55. The data is approximately normal and the standard deviation, σ, of the population is known. Ho: μ = 3.326, H1: μ 3.326. Should the statistician use a t distribution, a normal distribution, or neither to test the null hypothesis? (Points : 7)

t distribution Neither Normal distribution

13. In a study of monthly incomes, = 4160, sigma σ = 1480, n = 12. The data has a slight skew to the right. The alternative hypothesis is: μ 4576. Should the statistician use a t distribution, a normal distribution, or neither to test the null hypothesis? (Points : 7)

t distribution Neither Normal distribution

14. You wish to test the claim that μ < 3.35 at the = 0.02 significance level. In a sample of n = 25, the sample mean is 3.25 and the standard deviation of the sample is s = 0.87. What is the value of the appropriate test statistic? (Points : 7)

-2.87 -0.57 0.57 -0.11

15. You wish to test the claim that μ < 3.35 at the = 0.02 significance level. In a sample of n = 22, the sample mean is 3.19 and the standard deviation of the sample is s=0.77. What is the value of the appropriate test statistic? (Points : 7)

Is there any way that you can take a screenshot of the problems and post that? Many of the vital numbers in the problems are actually graphics instead of text and they don't come through when you copy and paste.

Once you have the screenshot, you can attach it to a reply in this thread by using the "paper clip" button on the toolbar. After clicking on the "paper clip" button, click on Browse and navigate through your the folders to find the file with the screenshot.

The appearance of the toolbar depends on the browser that you are using, so if it doesn't show up on your end, here is an alternative.

You can upload the screenshot file to a file-sharing website such as mediafire.com. After you upload your file to that site, they will assign a sharing URL to your file. Copy that link and past it into your reply here. It will look something like this:

Well, it would be easier, but I can't do that. That would violate this site's policies, and would jeopardize my position here. I'm pretty sure my family wouldn't appreciate that.

I'm working my way through these, and so far I believe I can figure out what is missing.

Here are the first five answers:

1. A. H0: µ = 21; H1: µ > 21

2. B. H0: µ = 46 degree; H1: µ ≠ 46 degree

3. D. 1.645

4. A. 1.48

5. B. There is sufficient evidence to support the claim that the true proportion is less than 2 in ten thousand.

I'll let you know if I have questions about any of the remaining problems, and I'll post the next five answers as soon as I have them.

thank you so much for your help this have been the hardest class every for me. I did not do to well on the last 2 test. This really helped me. One more week to go, please be available next week

And don't worry about it if life gets in the way and that time doesn't work out. I'm usually online all day anyway, so it won't be a big deal for me. The real purpose in setting the appointment is to make it convenient for you.

Attachments are only available to registered users.

Thanks again Ryan, this is definitely an acquired class and one best fit for the class room vs. on line but that wasn’t an option for me this time around. Life is definitely busy working full time, school full time, planning my June wedding, caring for my son and now expecting our new bundle in September. Thanks for helping it is soooooooo appreciated!

Just so you know, I'm going to post them in the other thread that you opened, since you have already rated an answer in this thread. JustAnswer prefers to keep questions in separate threads, so this will help keep me out of their doghouse.

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