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A study looked at number of cavity children per 100 in 18 North American cites before...

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Question

Statistics

A study looked at number of cavity children per 100 in 18 NorthAmerican cites before and after public water fluoridation projects.The following table lists the data.

City

Before

After

1

49.2

18.2

2

30

21.9

3

16

5.2

4

47.8

20.4

5

3.4

2.8

6

16.8

21

7

10.7

11.3

8

5.7

6.1

9

23

25

10

17

13

11

79

76

12

66

59

13

46.8

25.6

14

84.9

50.4

15

65.2

41.2

16

52

21

17

50

32

18

12

20

a. Please test whether there is a significant change in numberof cavity children per 100 after and before public waterfluoridation. Make sure you include all the five steps in thehypothesis testing questions.

b. What is the 95% confidence interval for the change?

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NumberBeforeAfterDifference di    See Answer
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