According to a study conducted by the Gallup organization, the proportion of Americans who are afraid to ﬂy is 0.10. A random sample of 1100 Americans results in 121 indicating that they are afraid to ﬂy. Explain why this is not necessarily evidence that the proportion of Americans who are afraid to ﬂy has increased since the time of the Gallup study.
Answer to relevant QuestionsExit polling is a popular technique used to determine the outcome of an election prior to results being tallied. Suppose a referendum to increase funding for education is on the ballot in a large town (voting population over ...Find the critical t-value for constructing a conﬁdence interval for a population mean at the given level of conﬁdence for the given sample size,n. (a) 99% conﬁdence;n = 18 (b) 90% conﬁdence;n = 27 One question asked in the General Social Survey was this: “How many e-mails do you send in a day?” The results of 928 respondents indicate that the mean number of e-mails sent in a day is 10.4, with a standard deviation ...A random sample of 50 recent college graduates results in a mean time to graduate of 4.58 years, with a standard deviation of 1.10 years. (a) Compute and interpret a 90% conﬁdence interval for time to graduate with a ...Construct a conﬁdence interval of the population proportion at the given level of conﬁdence. x = 80, n = 200, 98% conﬁdence
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