Question: Research results suggest that IQ scores for boys are more variable than IQ scores for girls. (Arden & Plomin, 2006). A typical study looking at 10-year-old children classifies participants by gender and by low, average, or high IQ. Following are hypothetical data representing the research results. Do the data indicate a significant difference between the frequency distributions for males and females? Test at the .05 level of significance and describe the difference.

Low IQ Average High

Boys 80

Girls 80

n=160