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Question: Give a variable that could be used to stratify the population for each of the following studies. List at least four subcategories for each variable.
a. A political party wants to conduct a poll prior to an election for the office of U.S. senator in Minnesota.
b. A soft drink company wants to take a sample of soft drink purchases in an effort to estimate market share.
c. A retail outlet wants to interview customers over a one-week period.
d. An eyeglasses manufacturer and retailer wants to determine the demand for prescription eyeglasses in its marketing region.
Comment briefly on the difference in answers between part d and part e. What important assumption regarding independence makes these answers different? Which assumption do you think is more realistic? Why?
Model the log odds of vigorous activity using an indicator variable for eating fruit two or more times per day as the explanatory variable. Summarize your findings.
A fair coin is tossed three times. Which of the following sequence is most likely to occur? H H H , H T H, T T T , all equally likey?
a computer processes tasks in the order they are received. each task takes an exponential amount of time with the
1.at what age do babies learn to crawl? does it take longer to learn in the winter when babies are often bundled in
State the null hypothesis and the alternate hypothesis. State the decision regarding the null hypothesis.
Coin tossing and the law of averages. The author C. S. Lewis once wrote the following, referring to the law of averages: "If you tossed a coin a billion times.
Does this sample provide enough evidence to conclude that self-esteem scores for group-participation adolescents are significantly different from those of the general population? Use a two-tailed test with α = .01.
How do we use a least squares regression line? What is the range for the coefficient of determination?
(which cannot be proved in general without the axiom of choice, to be treated in §1.5). Hint: Let B be a countably infinite subset of X \Y . Then B and B ∪ Y have the same cardinality.
womens heights are normally distributed with mean 63.7 in and standard deviation of 2.5 in. a social organization for
in a study designed to test the effectiveness of acupuncture for treating migraines 142 subjects were treated with
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