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The lives of many people are affected by a fear that prevents them from flying. The Marist Institute for Public Opinion conducted a poll of 1014 adults, 48%of whom were men. The results reported in USA Today showed that 12% of men and 33% of the women fear flying.
a) Is there sufficient evidence to conclude that there is a significant difference between the percentage of men and the percentage of women who fear flying?
b) Construct a 95% confidence interval for the percentage of men who fear flying.
c) Based on the results from (b) , which is typical of the statement that would be reported in a newspaper or magazine. "Based on the Public opinion poll, the percentage of men who feared flying is 12% with a margin of error of ?_____?
Two semiconductor factories are being compared to see if there is a difference in the average defect rates of the chips they produce. In the first factory, 250 chips are sampled. In the second factory, 350 chips are sampled. The proportions of def..
Roll a die and record the count of spots on the up face: P(1) = 0, P(2) = 1/6, P(3) = 1/3, P(4) = 1/3, P(5) = 1/6, P(6) = 0.
Determine the probability that Mexican American male in the 20 -74 age range has serum cholesterol value greater than 240 mg/dl.
Following is based on information from Statistical abstract of the United States, Dec, 1992. Are A and B mutually exclusive?
When the null hypothesis is rejected in the goodness-of-fit test, it means there is close agreement between the observed and expected frequencies.
A political strategist believes that less than 55% of voters in a certain state support a particular issue. He then commisions a poll of 500 voters and 54% of them support this issue. If = .05, is the political strategist's belief warranted?
Construct a 95 percent confidence interval for the difference in proportions for the two populations represented by these samples.
A researcher is interested in the effect of an electrolytic sports drink on the endurance of adolescent boys. A group of 30 boys is selected and half are given a treadmill endurance test while consuming the sports drink and the other half take the..
Assuming we can verify that the data set is approximately normally distributed, what percentage of times will the server be down less than 24 minutes?
Ten students in a graduate program were randomly selected. Their grade point averages (GPAs) when they entered the program were between 3.5 and 4.0.
If circuit switching is utilized, how many user can this access link support?
David Gallano, a wine merchant, has collected opinions on grape wine quality from a sample of his customers. These customers tasted wine made from grapes grown in three regions of the country.
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