One assumption of the test in Problem 10.68 is that the distribution of serum retinol is approximately
Question:
Table 10.32 Distribution of serum retinol in a retinitis-pigmentosa population
Serum-retinol group (μmol/L) ______________ n
¤1.40 ¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦.. 6
1.411.75 ¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦. 22
1.762.10 ¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦. 22
2.112.45 ¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦. 20
¥2.46 ¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦.. 3
¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦.. 73
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?
Ophthalmology
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 serum-retinol data in Table 10.31 were obtained over 3 years of follow-up among 73 males taking 15,000 IU/day of vitamin A (vitamin A group) and among 57 males taking 75 IU/day of vitamin A (the trace group; this is a negligible amount compared with usual dietary intake of 3000 IU/day).
Table 10.31 Effect of vitamin A supplementation on serum-retinol levels
Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...
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