Question
What is the estimated 95% confidence interval (CI) of the average difference in blood vitamin D levels between short sleeve shirt and tank top attire
What is the estimated 95% confidence interval (CI) of the average difference in blood vitamin D levels between short sleeve shirt and tank top attire amongst US landscapers in ng/mL?
Please note the following: 1) in practice, you as the analyst decide how to calculate the difference in vitamin D levels between time points for a given study participant, and subsequently interpret the aggregated results appropriately in the context of the data, though for the purposes of this exercise the difference is assigned for you as follows.Define the difference as the second minus the first time points, which is common practice, since the plus or minus sign of the resulting difference reflects any change over sequential time; 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; 3) ensure you use either the large or small sample CI formula as appropriate; and 4) you may copy and paste the data into Excel to facilitate analysis.
Select one:
a. -9.48 to -5.80 ng/mL
b. -11.00 to -6.15 ng/mL
c. -10.19 to -5.08 ng/mL
d. -10.90 to -6.68 ng/mL
Please show your work
Subject
Time Point 1, Shirts
Vitamin D (ng/mL)
Time Point 2, Tank Tops
Vitamin D (ng/mL)
1
40.106
44.145
2
52.319
35.450
3
51.127
37.446
4
53.078
39.214
5
55.989
43.040
6
52.755
44.139
7
52.458
39.561
8
54.570
41.586
9
52.347
56.725
10
49.604
45.987
11
52.675
45.429
12
47.348
59.696
13
57.244
38.922
14
42.454
33.190
15
49.129
51.989
16
54.505
49.763
17
45.329
41.898
18
61.387
50.971
19
51.135
43.931
20
45.059
45.549
21
56.931
39.031
22
53.860
48.220
23
55.568
40.952
24
48.179
41.401
25
47.144
43.844
26
43.207
40.157
27
52.864
42.663
28
50.728
42.246
29
50.826
43.085
30
48.712
37.488
31
45.671
44.693
32
50.500
44.842
33
55.079
42.736
34
54.252
43.533
35
54.300
42.726
36
46.885
45.954
37
39.654
38.801
38
57.457
46.297
39
52.107
44.961
40
49.951
44.151
41
56.890
36.196
42
52.984
39.325
43
50.935
42.066
44
50.244
36.445
45
45.168
45.181
46
54.465
42.422
47
54.110
44.147
48
56.639
53.244
49
54.782
41.547
50
51.920
53.520
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