Question 10 The chi-square values (for interval estimation) for a sample size of

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Question 10

The chi-square values (for interval estimation) for a sample size of 10 at 95% confidence are

Select one:

A. 3.32511 and 16.9190

B. 2.70039 and 19.0228

C. 4.16816 and 14.6837

D. 3.24697 and 20.4831

Question 11

A manager believes that the shelf life of Guava Juice is normally distributed. A sample of 30 containers of juice was taken and the shelf life was recorded. You are given the results below. The average shelf life in the sample was 23.07 days with a standard deviation of 4.29 days.

If the value of test statistic is 12.4 and the critical value of the test statistic is 7.81473, what is the conclusion?

Select one:

A. reject null hypothesis

B. don't reject null hypothesis

C. more information is needed to answer this question

D. None of the above answers is correct

Question 12

A sample of 28 elements is selected to estimate a 95% confidence interval for the variance of the population. The chi-square values to be used for this interval estimation are

Select one:

A. -1.96 and 1.96

B. 14.5733 and 43.1944

C. 16.1513 and 40.1133

D. 12.8786 and 46.9630

Question 13

Five hundred randomly selected automobile owners were questioned on the main reason they had purchased their current automobile. The results are given below.

State the null and alternative hypotheses for a contingency table test.

Select one:

A. Ho: automobile preference is independent of sex
Ha: automobile preference is not independent of sex

B. Ho: automobile preference is dependent on the sex
Ha: automobile preference is not dependent on the sex

C. More information is needed to answer this question

D. None of the above answers is correct

Question 14

Select one:

A. 20.91

B. 24.20

C. 24.00

D. 20.00

15 17 19 20 20 20 21 21 21 21 21 21 21 22 22 22 22 22 22 22 24 24 25 25 27 29 30 31 32 33

Explanation / Answer

10. For a sample size of 10,

Degrees of freedom = 10 - 1 = 9

So,

chi-square values (for interval estimation) for a sample size of 10 at 95% confidence are:

2.70039 and 19.0228

Option B is correct.

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