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The Harris/Excite instant poll used to be online. The question appears on the screen, and you simply click buttons to vote "Yes," "No," or "Don't Know." On January 25, 2000, the question was "Should female athletes be paid the same as men for the work they do?" In all, 13,147 (44%) said "Yes," another 15,182 (50%) said "No," and the remaining 1448 said "Don't know."
a) What is the sample size for this poll?
b) That's a much larger sample than standard sample surveys. In spite of this, we can't trust the result to give good information about any clearly defined population. Why?
c) It is still true that more men than women use the Web. How might this fact affect the poll results?
Construct a 99% confidence interval for the proportion of Americans who live in neighborhoods with acceptable levels of carbon monoxide.
An experiment was performed to investigate lifetime of a component exposed to high heat. Three different oven types were used at either 550°F or 600°F.
Determine the probability of a positive economic trend given an increasing employment. Are employment and economic trend independent?
Discuss how the null and alternative hypothesis for one-sample testing differs from two-sample testing; and explain how these two hypothesis' are the same, and provide a numerical example?
Fifty samples of size 600 were drawn from a manufacturing process and the number of defectives in each sample was counted.
A random sample of 50 households revealed a mean of $112,000 and a standard deviation of $40,000. What is the standard error of the mean?
A sample of approx 25 students enrolled in the university points out that X (bar) = $315.4 and s = $43.20.
IS there any evidence that a freshman's chances to graduate may depend upon what kind of high school the student attended? Describe.
Jamie expects that a bulb will last for 400 to 500 days, what is the probability of an Acme bulb satisfying that?
Employ the frequency distribution, which describes the response of a survey of college students when asked, "How often do you wear a seat belt when riding in a car driven by someone else?"
a) Find the marginal density of Y. b) Find E(X) HINT: What is E (X|Y=y) ?
At α = 0.10 test the claim that there is a difference in means of the salaries. (a) State the Hypotheses: (b) Compute the Test statistic: (Round off correctly)
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