Question: Suppose that the incomes of all people in the United
Suppose that the incomes of all people in the United States who own hybrid (gas and electric) automobiles are normally distributed with a mean of $78,000 and a standard deviation of $8300. Let be the mean income of a random sample of 50 owners of such automobiles. Calculate the mean and standard deviation of and describe the shape of its sampling distribution.
Answer to relevant QuestionsAccording to the American Time Use Survey, Americans watch television on weekdays for an average of 151 minutes per day (Time, July 11, 2011). Suppose that the current distribution of times spent watching television per ...For a population, N = 205,000, µ = 66, and σ = 7. Find the z value for each of the following for n = 49. a. = 68.44 b. = 58.75 c. = 62.35 d. = 71.82 Consider the following population of 10 numbers. a. Find the population mean. b. Rich selected one sample of nine numbers from this population. The sample included the numbers 20, 25, 13, 9, 15, 11, 7, 17, and 30. Calculate ...As mentioned in Exercise 7.33, among college students who hold part-time jobs during the school year, the distribution of the time spent working per week is approximately normally distributed with a mean of 20.20 hours and a ...Indicate in which of the following cases the central limit theorem will apply to describe the sampling distribution of the sample proportion. a. n = 400 and p = .28 b. n = 80 and p = .05 c. n = 60 and p = .12 d. n = 100 and ...
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