1). you know that the probability of commiting a type II error () is 5%. what is the power of the test?

a. 95%

b. 2.5%

c. 97.5%

d. it is unknown

2). the marketing manager for an automative manufacturer is interested in determining the proportion of new compact-car owners who would have purchase a GPS navigation system if it had been available for an additional cost of $300. the manager believes from previous information that the proportion is 0.30. suppose that a determine whether there is evidence that the proportion is different from 0.30. which test would you use?

a. Z-test of a population mean

b. t-test of a population proportion

c. t-test of population mean

d. z-test of a population proportion

3). what test should to be used if an economist wishes to determine whether there is evidence that mean family income in a community exceeds $50,000?

a. a one tail test should be utilized

b. either a one tail or two-tail test could be used with equivalent results

c. a two-tail test should be utilized

d. none of the above

4). the owner of the local nightclub has recently surveyed a random sample of n=250 customers of the club. she would now like to determine whether or not the mean age of her customer is greater than 30, if so, she plans to alter the entertainment to appeal to an older crowd. if not, no entertainment changes will be made. suppose she found that the sample mean was 30.45 years and the sample standard deviation was 5 years. is she wants to have a level of significance at 0.01 what conclusion can she make?

a. there is not sufficient evidence the the mean age of her customers is greater than 30

b. there is not sufficient evidence the the mean age of her customers is not greater than 30

c. there is sufficient evidence the the mean age of her customers is not greater than 30

d. there is sufficient evidence the the mean age of her customers is greater than 30.

5). researchers determined that 60 tissues is the man number of tissues used during a cold. suppose a random sample of 100 Kleenex users yielded the following data on the number of tissues used during cold x=52, S=22. suppose the test statistic does fall in the rejection region at =0.05. which of the following decisions is correct?

a. at - 0.10, you reject Ho

b. at =0.05, you do not reject Ho

c. at =0.05, you reject Ho

d. at - 0.10, you do not reject Ho

6). in testing for differences between the means of two independent population, what is the null hypothesis?

a. Ho: 1-2 = 2

b. Ho: 1-2 < 2

c. Ho: 1-2 > 0

d. Ho: 1-2 = 0

7). if in a sample of n=25 selected from a normal population, x=59 and S=20, how many degrees of freedom does the test have you are testing the null hypothesis Ho: =50 ? the degree of freedom are ?

8). an experiment has a single factor with four groups and five values in each group. how many degrees of freedom are there in determining the within-group variation?

a. 1

b. 17

c. 8

d. 9