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Key terms in survey questions are often not well understood, and such ambiguity can affect responses. As an example, the article "How Unclear Terms Affect Survey Data" (Public Opinion Quarterly [1992]: 218-231) described a survey in which each individual in a sample was asked, "Do you exercise or play sports regularly?" But what constitutes exercise? The following revised question was then asked of each individual in the same sample: "Do you do any sports or hobbies involving physical activities, or any exercise, including walking, on a regular basis?" The resulting data are shown in the accompanying table.
Can a procedure from this chapter be used to answer the following question: Is there any difference between the proportions of yes responses to these questions? If yes, carry out the test. If not, explain why not.
From the magazine's findings, and assuming a normal distribution, determine the 95% confidence interval for the population standard deviation of the force required to depress the firm's aspi- rin bottle caps.
You decide to calculate the coefficient of determination (R2) as part of determining the goodness of fit of an equation. Using the preliminary calculations below, calculate the R2 and determine its meaning.
Seasonal Dyslexia. Researchers at the University of Arkansas theorize that exposure to influenza and other viral diseases in the second trimester of pregnancy.
When is a permutation test valid? You want to test the equality of the means of two populations. Sketch density curves for two populations.
Find the probability that the test for a pooled sample of k people will be positive - what is the expected value of the number X of tests necessary under plan
A financial planner wants to compare the yield of income- and growth-oriented mutual funds. Fifty thousand dollars is invested in each of a sample of 35 income-oriented and 40 growth-oriented funds.
a two-stage clinical trial is planned for for testing h0 p0.10 versus ha pgt0.10 where p is the proportion of
odds makers try to predict which professional and college football teams will win and by how much the spread. if the
A researchers wish to estimate, with 95% confidence, the proportion of people who own a home computer. A previous study shows the 40% of those interviewed had a computer at home.
More cereal. In Exercise we poured a large and a small bowl of cereal from a box. Suppose the amount of cereal that the manufacturer puts in the boxes.
A survey of households in a farming village in Nepal asked, "Do women from your household collect firewood?" and "How many women from your household collect.
Suppose that combined verbal and math SAT scores follow a normal distribution with mean 896 and standard deviation 174. Suppose further that Peter finds out that he scored in the top 3% of SAT scores. Determine how high Peter's score must have bee..
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