Why do polling companies often survey 1060 individuals when they wish to estimate a population proportion with a margin of error of 3% with 95% conﬁdence?
Answer to relevant QuestionsKatrina wants to estimate the proportion of adultAmericans who read at least 10 books last year. To do so, she obtains a simple random sample of 100 adult Americans and constructs a 95% conﬁdence interval. Matthew also ...Lower bound: 5, upper bound: 23 Determine the point estimate of the population mean and margin of error for each conﬁdence interval. A random sample of 51 fatal crashes in 2009 in which the driver had a positive blood alcohol concentration (BAC) from the National Highway Trafﬁc Safety Administration results in a mean BAC of 0.167 grams per deciliter ...The following data represent the age (in weeks) at which babies ﬁrst crawl based on a survey of 12 mothers conducted by Essential Baby. Construct and interpret a 95% conﬁdence interval for the mean age at which a baby ...A recent Gallup poll asked Americans to disclose the number of books they read during the previous year. Initial survey results indicate that s = 16.6 books. (a) How many subjects are needed to estimate the number of books ...
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