Helleo I need to see how the problems are solved. Question 3 What is the estimated 95% confidence interval (CI) of the average blood vitamin D level

Helleo I need to see how the problems are solved.

Question 3

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.

Table

SubjectVitamin D

131.154

227.281

323.720

433.339

526.287

632.446

724.251

834.456

932.453

1035.134

1135.133

1240.285

1321.727

 1430.853

1531.988

1630.340

1729.415

1829.584

1928.410

 Select one:

 a. 23.9 to 30.5 ng/mL

 b. 28.3 to 32.6 ng/mL

 c. 25.1 to 36.9 ng/mL

 d. 26.3 to 34.9 ng/mL

Question 4

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.

SubjectTime Point 1, Shirts Vitamin D (ng/mL)Time Point 2, Tank TopsVitamin D (ng/mL)

124.91746.197

234.24443.773

338.49345.416

435.03442.317

537.78243.104

640.00934.361

732.45143.086

841.30837.297

938.89840.397

1043.51949.960

1144.90044.012

1239.41944.247

1337.54349.224

1425.40346.836

1530.94948.519

1637.38747.452

1738.30845.390

1836.64834.849

1939.62739.983

2036.21337.913

2135.19649.176

2242.56150.226

2332.90539.949

2438.39147.011

2530.18749.931

2632.47341.003

2736.46456.921

2840.46048.912

2933.73745.581

3041.01747.342

3132.34150.199

3234.01945.659

3340.31634.855

3430.24655.200

3532.24052.038

3621.71044.645

3728.50250.402

3824.50345.842

3939.38539.854

Select one:

a. 5.97 to 14.32 ng/mL

b. 7.06 to 12.39 ng/mL

c. 7.77 to 14.25 ng/mL

d. 6.50 to 13.39 ng/mL