What is the estimated 95% confidence interval (CI) of the average blood vitamin D level of US landscapers in ng/mL?

Please note the following: 1) 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; 2) ensure you use either the large or small sample CI formula as appropriate; and 3) you may copy and paste the data into Excel to facilitate analysis. Please show your work

Select one:

a. 41.3 to 46.6 ng/mL

b. 38.0 to 54.1 ng/mL

c. 36.3 to 53.6 ng/mL

d. 36.1 to 52.4 ng/mL

Subject

Vitamin D

1

47.643

2

44.399

3

43.156

4

47.434

5

35.310

6

49.901

7

46.305

8

43.427

9

36.009

10

46.445

11

54.566

12

41.183

13

44.757

14

39.718

15

40.433

16

52.161

17

40.717

18

45.794

19

31.052

20

40.535

21

52.027

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