_____ 10. If all other factors are held constant, increases in the difference between the sample mean and the population mean will _________ the value of the t-statistic.

a. increase

b. decrease

c. have no effect on

d. can't answer:Not enough information

_____ 11. A researcher is conducting an experiment to evaluate a treatment that is expected to increase the scores for individuals in a population which is known to have a mean of = 80.The results will be examined using a one-tailed hypothesis test.Which of the following is the correct statement of the null hypothesis?

a. > 80

b. > 80

c. < 80

d. < 80

_____ 12. Which of the following would be the research hypothesis?

a. Children who go to Head Start programs will learn to read sooner than children

who do not go

b. There will be no difference in learning to read between children who go to Head Start

programs and children who do not go

c. Ages of children must be equated to insure there are no differences due to

maturation level

d. An unbiased random sample must be obtained prior to conducting the research