Question 1

What is the estimated 95% confidence interval (CI) of the average difference in blood vitamin D levels between US landscapers and office workers in ng/mL? Assign groups 1 and 2 to be landscapers and office workers, respectively.Top of Form Question 1

Table 1. Landscapers Table 2. Office Workers

Subject Vitamin D Subject Vitamin D

1 29.73 1 49.538

2 33.898 2 50.3

3 34.105 3 53.941

4 36.952 4 39.762

5 39.145 5 51.33

6 48.349 6 49.482

7 42.362 7 49.171

8 25.749 8 47.115

9 31.081 9 47.304

10 34.391 10 45.974

11 30.296 11 50.839

12 40.71 12 41.927

13 35.627 13 51.509

14 36.168 14 50.152

15 43.903 15 38.821

16 30.207 16 41.427

17 23.283 17 41.755

18 38.416 18 46.212

19 30.762 19 41.513

20 39.526 20 43.97

21 37.024 21 57.52

22 29.264 22 48.433

23 39.398 23 45.217

24 35.64

25 29.706

26 35.971

27 29.113

28 33.865

29 42.655

30 43.802

31 43.12

32 32.618

33 39.438

34 44.549

35 25.432

36 40.351

37 38.143

38 41.094

39 33.389

40 42.826

Select one:

a. -15.67 to -8.93 ng/mL

b. -15.47 to -7.50 ng/mL

c. -13.93 to -8.16 ng/mL

d. -14.91 to -6.93 ng/mL

Question 2

What is the estimated 95% confidence interval (CI) of the proportion of schoolchildren developing nausea and vomiting following holiday parties?

Please note the following: 1) 0 and 1 are defined as no and yes, respectively, which is a typical coding scheme in Public Health; 2) you might calculate a CI that is different from any of the multiple choice options listed below due to rounding differences, therefore select the closest match; and 3) you may copy and paste the data into Excel to facilitate analysis.

Table

Subject Nausea and

Vomiting?

1 1

2 0

3 0

4 1

5 1

6 1

7 1

8 0

9 0

10 1

11 1

12 1

13 1

14 0

15 1

16 0

17 1

18 0

19 0

20 0

21 1

22 0

23 0

24 1

25 1

26 0

27 0

28 0

29 0

30 0

31 0

32 1

33 0

34 1

35 1

36 1

37 0

38 0

39 1

Select one:

a. 0.296 to 0.583

b. 0.330 to 0.644

c. 0.287 to 0.696

d. 0.307 to 0.741