# Question

According to an estimate, the average age at first marriage for men in the United States was 28.2 years in 2010 (Time, March 21, 2011). Suppose that currently the mean age for all U.S. men at the time of first marriage is 28.2 years with a standard deviation of 6 years and that this distribution is strongly skewed to the right. Let be the average age at the time of first marriage for 25 randomly selected U.S. men. Find the mean and the standard deviation of the sampling distribution of . What if the sample size is 100? How do the shapes of the sampling distributions differ for the two sample sizes?

## Answer to relevant Questions

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 ...For a population, N = 10,000, µ = 124, and σ = 18. Find the z value for each of the following for n = 36. a. = 128.60 b. = 119.30 c. = 116.88 d. = 132.05 The GPAs of all students enrolled at a large university have an approximately normal distribution with a mean of 3.02 and a standard deviation of .29. Find the probability that the mean GPA of a random sample of 20 students ...According to a PNC Financial Independence Survey released in March 2012, today’s U.S. adults in their 20s “hold an average debt of about $45,000, which includes everything from cars to credit cards to student loans to ...A population of N = 1400 has a population proportion equal to .47. In each of the following cases, which formula will you use to calculate σp̂ and why? Using the appropriate formula, calculate σp̂ for each of these ...Post your question

0