Fluoride Exposure in Drinking Water Exercise 2.250 introduces a study showing that fluoride exposure might have long-term negative consequences for the offspring of pregnant women. Part of the study examines the effect of adding flu- oride to tap water on mean fluoride concentration in women. Summary statistics for fluoride concen- tration (measured in mg/L) for the two groups are given in Table 6.17. Find and interpret a 99% con- fidence interval for the mean increase in fluoride concentration for those with fluoridated tap water.  1. find the t-score enter positive z-score  2. find the standard of error round 4 decimal places.  3 find the margin of error round 4 decimal places

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