Chapter 17, Problem 19P

19. Research indicates that people who volunteer to par­

ticipate in research studies tend to have higher intel-

ligence than nonvolunteers. To test this phenomenon,

a researcher obtains a sample of 200 high school stu-

dents. The students are given a description of a psycho­

logical research study and asked whether they would volunteer to participate. The researcher also obtains an IQ score for each student and, classifies the students into high, medium , and low IQ group. Do the following data indicate a significant relationship between IQ and votunteering? Test at the .05 level of significance.

Volunteer

High

IQ

Medium

Low

0

Not

Volunteer

 100 50