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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 cards are drawn without replacement from a pack X measures hearts drawn and Y measures clubs drawn, both are random variables.
List all samples of 3 and compute the mean of each sample. Compute the mean of the distribution of sample means and population mean. compare the two values
What is the probability of a fatal accident over a lifetime?
Compute the variance and standard deviation of the number that will arrive within two days.
According to the U.S. Bureau of the Census, 75% of adults regularly drank alcohol in 1985. An investigator predicts that fewer adults drink now than drank then.
Kyle averages 7 finished accounts a day. His standard deviation is 2 account per day and we wish the probability that Kyle will finish day with more than 8 finished accounts. Probability will be?
Evaluate the factor effects. Find out which factors are significant in explaining yield.
If we want to estimate the populations mean travel-to-work time San Francisco residents with a margin of error of 1 minute, what sample size should be used? Assume 95 percent confidence.
(a) Find the range. (b) Find the variance. (Give your answer correct to two decimal places.) (c) Find the standard deviation. (Give your answer correct to two decimal places.)
Assume that standard deviation is $3,204 and that 36 four-year institutions are arbitarily selected. Determine the probability that sample mean cost for these 36 schools is less than $25,000.
Last week Sarah had exams in Math and in Spanish. On the math exam, the mean was m = 40 with s = 5, and Sarah had a score of X = 45. On the Spanish exam, the mean was m = 60 with s = 8 and Sarah had a score of X = 68. For which class should Sara e..
The scores of college-bound senior men on the math part of the SAT followed a normal distribution with mean 527 and standard deviation 116.
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