A researcher is interested in the effect that neighborhood crime-watch efforts have on the crime rate in the inner city, but he is unwilling to predict the direction of the difference. The appropriate test of hypothesis would be________.
A) one-tailed
B) two-tailed.
C) descriptive.
D) symmetrical.

Question

Quizplus · Accepted Answer

A two-tailed test of hypothesis is appropriate when there is no clear direction of the difference between the two groups being compared. In this case, the researcher is interested in the effect of neighborhood crime-watch efforts on crime rate, but is not predicting whether it will decrease or increase the crime rate. Therefore, a two-tailed test would be appropriate to test for any significant difference between the two groups.

A Researcher Is Interested in the Effect That Neighborhood Crime-Watch