_____ 1. Researchers make hypotheses about:

a.parameters, because they want to make inferences about populations

b.parameters, because they want to make inferences about samples

c.statistics, because they want to make inferences about populations

d.statistics, because they want tomake inferences about samples

_____ 2. Setting a = .05 means that:

a.there is a .05 probability that the H0will be rejected in error

b.there is a .95 probability that the H0will be rejected in error

c.there is a .05 probability that the H1will be rejected in error

d.there is a .95 probability that the H1will be rejected in error

_____ 3. Which of the following decreases the magnitude of the z statistic:

a.increasing n

b.increasing s

c.increasing the difference between m and x

d.none of the above