Ch. 2

Front

A sample that is not representative of the population one intends to study, is a _____ sample.

Back

biased

Front

Scores on a test and subsequent ratings of performance indicated a correlation coefficient of +1.5. Based on this correlation coefficient, a researcher would be justified in telling the company that:

Back

the correlation coefficient calculated is incorrect.

Front

If you wanted to use a number to represent the typical scene in your set of data, you should use:

Back

measures of central tendency.

Front

A professor is investigating the effect of drinking coffee on exam grades. Which statement is an example of a between-groups experimental approach to this research question? Telling all the students to drink coffee and comparing the exam scores of students who did not with those who did. He divides the exam questions into two groups: those for which drinking coffee should have aided learning and those for which it should not have helped. He tells one group of randomly selected students to drink coffee, and the other students not to drink coffee. He compares performance on the first exam, in which students were given instructions to not drink coffee to that of the second exam, in which students drank coffee.

Back

He tells one group of randomly selected students to drink coffee, and the other students not to drink coffee.