Rates of bipolar disorder are higher in this population.

As a person falls into deeper sleep, his or her pattern of brain-wave activity becomes both ____ in frequency and ____ in amplitude

a. slower; higher b. faster; higher c. slower; lower d. faster; lower

How do researchers and test developers identify systematic error in test scores?

a. Using analysis of variance b. Using correlation c. Constructing a confidence interval d. Calculating the standard error of measurement