Chapter 2 part B

The mean scores of all third grade classes on a standardized achievement test.

• Descriptive

• Inferential

The results of the TV ratings as obtained by TV rating company for 3000 households with the people-meter (the "black box").

• Descriptive

• Inferential

The blood pressure of a group of volunteers given a new experimental drug to lower blood pressure.

• Decriptive

• Inferential

The blood pressure of a group of volunteers given a new experimental drug to lower blood pressure.

• Systematic sample

• Random sample

A hypothesis that predicts that there is a difference or relationship between variables or groups is called the ____________ hypothesis, and is represented by the symbol H_A or H₁.

• Null

• Alternative

To analyze data measured on a nominal scale, researchers should use______________statistics.

• parametric

• nonparametric

If we reject the null hypothesis at p<.01, we are _______________confident that we made the right decision compared with rejecting the null hypothesis at the p<.05 level.

• more

• less

The standard error of the means is the standard deviation of the

• sample means

• population means

When we predict which mean is going to be higher, our hypothesis is .

• directional

• nondirectional

The error made by researchers who retain a null hypothesis when in fact it should be rejected is called a_________ error.

• Type I

• Type II