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Refer to given Exercise, comparing vegetarians and nonvegetarians for two causes of death. Were base rates given for the two causes of death? If so, what were they? If not, explain what a base rate would be for this study.
ExerciseAn article in the magazine Science (Service, 1994) discussed a study comparing the health of 6000 vegetarians and a similar number of their friends and relatives who were not vegetarians. The vegetarians had a 28% lower death rate from heart attacks and a 39% lower death rate from cancer, even after the researchers accounted for differences in smoking, weight, and social class. In other words, the reported percentages were the remaining differences after adjusting for differences in death rates due to those factors.
a. Is this an observational study or a randomized experiment? Explain.
b. On the basis of this information, can we conclude that a vegetarian diet causes lower death rates from heart attacks and cancer? Explain.
c. Give an example of a potential confounding variable and explain what it means to say that it is a confounding variable.
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In other words, explain why, all else being equal, as sample size increases the likelihood of finding a statistically significant relationship increases.
can a test of significance show a statistically significant relationship while a measure of association shows a weak
Your bank sends you a summary statement, giving the average amount of all checks you wrote during the month.- Using this and the information provided by the bank, can you figure out the amounts of the two missing checks?
Basic Statistics problem
Sketch the distribution involved.
Identify at least 2 variables for which you would utilize a repeated-measures ANOVA in your analysis. Describe the variables and their scale of measurement.
It is known that in a sack of mixed bean seeds, 35% are yellow beans. Use the normal approximation to the binomial distribution to find the probability that in a sample of 400 beans there are
you draw two cards from a standard deck of 52 cards without replacing the first one before drawing the second. find the
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Find the average premium received per policyholder of the insurance company of Example 4.27 if λ= 1/4 for one-third of its clients, and λ = 1/2 for two-thirds of its clients.
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