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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?
Let random variable X represent number of heads on first toss and y total number of heads from three tosses. Sketch tree view with X as first level and Y/X as second level and determine conditional probability p(Y=2/X=1).
What is the probability that the average of the scores of the two students from university A will be greater than average of the scores of the three students from University B?
You wish to evaluate the proportion of customers who are satisfied with their supermarket at level of confidence of .92 and in .025 of true value. How large of sample is required?
Discuss how the concept of behavioral variability relates to the research questions that interest behavioral researchers.
In a study of 368 San Francisco Bay Area nonprofits, 224 reported that they are collaborating with other organizations to provide services, a necessity as nonprofit agencies are called upon to do more with less.
Examples of the binomial and poisson distributions are all around us. Identify a real-life example or application of either the binomial or poisson distribution. Specify how the conditions for that distribution are met.
Use a P-value to test the claim about the population mean using the given sample statistics. State your decision for a=0.05. Claim: mean does not = 230
The mean height of the women in a large population is 1.671m while the mean height Of the men in the population is 1.758m. The mean height of all the members of the Population is 1.712m. Calculate the percentage of the population who are women.
The population standard deviation was 1.68 years. Using the 99% degree of confidence, what is the confidence interval for the population mean.
If 900 users visited the site, would the probability that more than 250 of them click on an ad be higher or lower than the answer found in part
Survey on marital status to determine whether the data is qualitative or quantitative
What is the probability that the trainee class will consist entirely of men or women? Round your answer to the nearest thousandth.
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