Fluoride and IQ Exercise 2.250 introduces a study examining the association between fluoride exposure in pregnant women and subsequent IQ scores of their children. Fluoride is often added to drinking water to prevent tooth decay, but the study found that higher maternal fluoride levels were associated with lower IQ scores in children. The regression analysis was done separately for boys and girls, and in each case, the article reports both the 95% confidence interval for the slope and the p-value for testing the slope. The two p-values are 0.33 and 0.02. Match the p-values with the confidence intervals: (a) 95% CI for slope for boys: -8.38 to -0.60 (b) 95% CI for slope for girls: -2.51 to 7.36