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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
a. 0.296 to 0.583
b. 0.330 to 0.644
c. 0.287 to 0.696
d. 0.307 to 0.741
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