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
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
![Table 6.17 Fluoride in tap water
Sample size
141
228
Tap water
Fluoridated
Non-fluoridated
Mean
0.69
0.40
St.Dev.
0.42
0.27](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F4dbd844a-5288-4e1f-bdaf-b70c666aee4d%2F26f061d0-2dc4-4f27-a0dc-0fd0762ef656%2Fsxxf2b_processed.jpeg&w=3840&q=75)
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