A 5-year study among 601 participants with retinitis pigmentosa assessed the effects of high-dose vitamin A (15,000 IU per day) and vitamin E (400 IU per day) on the course of their disease. One issue is to what extent supplementation with vitamin A affected their serum-retinol levels. The test used to analyze the effects of vitamins assumes that the distribution of serum retinol is approximately normal. To verify this assumption, the investigators obtained a frequency distribution of serum retinol at year O among males in the vitamin A group, with data as shown in the table below. The mean serum retinol for the group was 1.89 and the standard deviation was 0.36. n Serum- retinol group (μmol/L) ≤1.405 6 1.405-1.755 22 1.755-2.105 22 2.105-2.455 20 ≥2.455 3 1. Perform a statistical test to check on the normality assumption. Given your results, do you feel the assumption of normality is warranted? Why or why not?
A 5-year study among 601 participants with retinitis pigmentosa assessed the effects of high-dose vitamin A (15,000 IU per day) and vitamin E (400 IU per day) on the course of their disease. One issue is to what extent supplementation with vitamin A affected their serum-retinol levels. The test used to analyze the effects of vitamins assumes that the distribution of serum retinol is approximately normal. To verify this assumption, the investigators obtained a frequency distribution of serum retinol at year O among males in the vitamin A group, with data as shown in the table below. The mean serum retinol for the group was 1.89 and the standard deviation was 0.36. n Serum- retinol group (μmol/L) ≤1.405 6 1.405-1.755 22 1.755-2.105 22 2.105-2.455 20 ≥2.455 3 1. Perform a statistical test to check on the normality assumption. Given your results, do you feel the assumption of normality is warranted? Why or why not?
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
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Transcribed Image Text:A 5-year study among 601 participants with retinitis pigmentosa assessed the effects of high-dose vitamin A (15,000 IU
per day) and vitamin E (400 IU per day) on the course of their disease. One issue is to what extent supplementation with
vitamin A affected their serum-retinol levels. The test used to analyze the effects of vitamins assumes that the distribution
of serum retinol is approximately normal. To verify this assumption, the investigators obtained a frequency distribution of
serum retinol at year O among males in the vitamin A group, with data as shown in the table below. The mean serum
retinol for the group was 1.89 and the standard deviation was 0.36.
n
Serum-
retinol
group
(μmol/L)
≤1.405
6
1.405-1.755
22
1.755-2.105
22
2.105-2.455
20
≥2.455
3
1. Perform a statistical test to check on the normality assumption. Given your results, do you feel the assumption of
normality is warranted? Why or why not?
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