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An epidemiologist is trying to discover the cause of a certain kind of cancer. He studies a group of 10,000 people for five years, measuring 48 different "factors" involving eating habits, drinking habits, smoking, exercise, and so on. His object is to determine if there are any differences in the means of these factors (variables) between those who developed the given cancer and those who did not. He assumes that these variables are independent, even though there may be evidence to the contrary. In an effort to be cautiously conservative, he uses the 0.01 level of significance in all his statistical tests.
(a) What is the probability that one of these factors will be "associated with" the cancer, even if none of them is a causative factor?
(b) What is the probability that more than one of these factors will be associated with the cancer, even if none of them is a causative factor?
in the standard normal distribution what is the probability that a value is greater than
Two thousand two hundred frequent business travelers are asked which midwestern city they prefer: Indianapolis, Saint Louis, Chicago, or Milwaukee. 112 liked Indianapolis best, 452 liked Saint Louis, 1295 liked Chicago, and the remainder preferred..
there are two major internet providers in the colorado springs colorado area one called htc and the other mountain
A study found that 38% of the assisted reproductive technology (ART) cycles resulted in pregnancies. Twenty-six percent of the ART pregnancies resulted in multiple births.
Determine the expected frequencies for each of the cells in the following contingency tables. For each problem, state how many of the expected values actually had to be computed and how many could be found by subtraction.
If a member of the sales force submits an entertainment expense (dinner cost for four) of $190, should this expense be considered unusually high (and possibly worthy of investigation by the company)?
What is the value of s, the estimate of ? (f) What percent of the variation in GPA is explained by HSM and SATM in your model? How well do verbal variables predict the performance of computer science students?
Place a 95% confidence interval about the population mean number of down hours per month.
a. Fit first-order simple linear regression model (2.1) for relating brand liking (Y) to moisture content (X,). State the fitted regression function.
What decision should be made regarding the null hypothesis?
The weight of a one cubic yard bag of landscape mulch is normally distributed with a mean of 40 pounds and a standard deviation of 2 pounds. What is the probability that a bag will weigh less than 40 pounds?
a company excavates gold and silver from 2 different mines. each hour that the company operates in mine 1 produces 2 kg
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