The Perry Preschool Project data presented in Exercise 10.39 (Schweinhart et al. 2005) can be divided to see whether the preschool attendance effect is different for males and females. The table shows a summary of the data for females, and the figure shows Minitab output that you may use.
a. Find the graduation rate for those females who went to preschool, and compare it with the graduation rate for females who did not go to preschool.
b. Test the hypothesis that preschool and graduation rate are associated, using a significance level of 0.05.

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