Read the z statistic from the normal distribution table and

Read the z statistic from the normal distribution table and circle the correct answer. A one-tailed test (lower tail) at a .063 level of significance; z =

d. -1.960

Refer to Exhibit 9-3. If the test is done at a 5% level of significance, the null hypothesis should:

The smaller the p-value,

The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took the customers in the sample to check out was 3.1 minutes. The population standard deviation is known to be .5 minutes. We want to test to determine whether or not the mean waiting time of all customers is significantly more than 3 minutes.

Refer to Exhibit 9-2. The p-value is:

In order to test the hypotheses H₀: 100 and H_a: > 100 at an level of significance, the null hypothesis will be rejected if the test statistic z is:

The practice of concluding \"do not reject H₀\" is preferred over \"accept H₀\" when we:

a. -1.860

b. -1.530

c. -1.645

d. -1.960 Exhibit 9-3 Refer to Exhibit 9-3. If the test is done at a 5% level of significance, the null hypothesis should: a. None of the other answers are correct. b. not be rejected. c. be rejected. d. Not enough information given to answer this question. The smaller the p-value, a. the less likely you are to reject H0. b. the greater the chance of committing a Type I error. c. the greater the chance of committing a Type II error. d. the greater the evidence against H0 The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took the customers in the sample to check out was 3.1 minutes. The population standard deviation is known to be .5 minutes. We want to test to determine whether or not the mean waiting time of all customers is significantly more than 3 minutes. Refer to Exhibit 9-2. The p-value is: a. .0500 b. .0228 c. .0456 d. .0250 In order to test the hypotheses H0: 100 and Ha: > 100 at an level of significance, the null hypothesis will be rejected if the test statistic z is: a. < 100 b. < z c. -z d. z The practice of concluding \"do not reject H0\" is preferred over \"accept H0\" when we: a. have an insufficient sample size. b. have not controlled for the Type II error. c. are testing the validity of a claim. d. are conducting a one-tailed test

Solution

1)C

2)D

3)A

4)B

5)A

6)A