chapter 7 stats

A _______ is a hypothesis that reflects the difference between groups but does not specify the direction of the difference. A. null hypothesis B. directional research hypothesis C. nondirectional research hypothesis D.none of these

C. nondirectional research hypothesis

The _______ is defined as an "educated guess" that describes the relationship between variables.

hypothesis

In a study, a _______ is drawn from a _______. A. sample; larger population B. sample; smaller population C. population; smaller sample D. population; larger sample

A. sample; larger population

Which of the following represents a null hypothesis? A. H1: X1 < X2 B. H0: m1 = m2 C. H1: m1 > m2 D.H1: X1 = X2

B. H0: m1 = m2

Inferential statistics allow us to A. infer something about the sample based on the population. B. infer something about the population based on the sample. C. infer that the sample is representative. D. do all of these

B. infer something about the population based on the sample.

In a study on the effects of the amount of sleep on driving performance, researchers predict that those in the group that is allowed more sleep will exhibit better driving performance. The researchers are using a _____ hypothesis. A.two-tailed B.directional C.one-tailed D. one-tailed and directional

D. one-tailed and directional

Research hypotheses refer to _______. A. the population B. multiple samples C. multiple populations D. the sample

D. the sample

When using a _____ hypothesis the researcher predicts that the groups being compared will differ, but does not predict how they will differ. A. null B. directional C.one-tailed D. two-tailed

D. two-tailed

A good hypothesis is stated as a question.

False

A one-tailed test would be used with a directional research hypothesis.

True