Confidence interval for the population proportion of us
In a survey of 891 US adults who follow baseball in a recent year, 184 said that the Boston Red Sox would win the World Series. Construct a 90% confidence interval for the population proportion of US adults who follow baseball as stated above.
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The mean age at which men in the United States marry for the first time follows the normal distribution with a mean of 24.6 years. The standard deviation of the distribution is 2.6 years.
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The population mean annual salary for flight attendants is $56,275. A random sample of 48 flight attendants is selected from this population. What is the probability that the mean annual salary of the sample is less than $56,100? Assume =$1800
Calculate a 99% confidence interval for the true mean of a bearing's diameter when a sample of 16 of the bearings have a diameter mean of 3.42 mm and a std of 0.68 mm.
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