The weights of all students at a large university have an approximately normal distribution with a mean of 145 pounds and a standard deviation of 18 pounds. Let be the mean weight of a random sample of certain students selected from this university. Calculate the mean and standard deviation of and describe the shape of its sampling distribution for a sample size of
Answer to relevant QuestionsAccording to an estimate, the average price of homes in Martha’s Vineyard, Massachusetts, was $650,000 in 2011 (USA Today, August 11, 2011). Suppose that the current population distribution of home prices in Martha’s ...Find z for each of the following confidence levels. a. 90% b. 95% c. 96% d. 97% e. 98% f. 99% A survey of 500 randomly selected adult men showed that the mean time they spend per week watching sports on television is 9.75 hours with a standard deviation of 2.2 hours. Construct a 90% confidence interval for the ...Salaried workers at a large corporation receive 2 weeks’ paid vacation per year. Sixteen randomly selected workers from this corporation were asked whether or not they would be willing to take a 3% reduction in their ...When one is attempting to determine the required sample size for estimating a population mean, and the information on the population standard deviation is not available, it may be feasible to take a small preliminary sample ...
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