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Question: MS and vitamin D. Multiple sclerosis (MS) is an autoimmune disease that strikes more often the farther people live from the equator. Could vitamin D-which most people get from the sun's ultraviolet rays-be a factor? Researchers compared vitamin D levels in blood samples from 150 U.S. military personnel who have developed MS with blood samples of nearly 300 who have not. The samples were taken, on average, five years before the disease was diagnosed. Those with the highest blood vitamin D levels had a 62% lower risk of MS than those with the lowest levels. (The link was only in whites, not in blacks or Hispanics.)
a) What kind of study was this?
b) Is that an appropriate choice for investigating this problem? Explain.
c) Who were the subjects?
d) What were the variables?
You're applying to graduate school and have found a list of the top 50 PhD programs for your area of study. For each of the following scenarios, state which nonparametric hypothesis test is most appropriate:
Using the table in given Exercise, what is the probability that a randomly selected victim would have been at least 60 years old and have had a blood alcohol level of at least 0.10%?
Find ten consecutive composite numbers. Find the prime factors of 1147 and of 1716. Are there any common factors?
Show that the length of this con?dence interval tends to 0 in probability (and also a.s.) as n ® ¥; Discuss part (i) for the case that the underlying distribution is B(1, q), q Î Ù = (0, 1) or P(q), q Î Ù = (0, ¥).
raisel is the new statistician at a cola company. she wants to estimate the proportion of the population who enjoy
The Oregon health & science university's news website gives information on a study that found that some commercial cigarette brands contain 10 to 20 times higher percentages of nicotine in the "free-base" form, that is, the form thought to be ..
a. Calculate the sample correlation coefficient. b. Use the 5% significance level to test for a positive population correlation between the time on the shelf ("X") and the moisture content ("Y").
Calculate a 90% confidence interval for the percentage of homes in the US that had guns at the time of survey.
question an fbo a fixed-base-operator usually the manager of a small-town airport makes his revenue in three ways
Identify the experimental unit for the study.- Identify the variable measured for each experimental unit.- Is the data collected quantitative or qualitative?
Findout the normal model for the given proportions. The professor has every student toss a coin 50 times also calculated the proportion
the researchers sample had a SD of 1.2 years. construct a 99% CI for the population mean
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