# Question: The average income in the District of Columbia in 2013

The average income in the District of Columbia in 2013 was $76,000 per person per year, and that was larger than the average for any state. Suppose the standard deviation is $35,000 and the distribution is right-skewed. Suppose we take a random sample of 100 residents of D.C.

a. What value should we expect for the sample mean? Why?

b. What is the standard error for the sample mean?

a. What value should we expect for the sample mean? Why?

b. What is the standard error for the sample mean?

## Answer to relevant Questions

Reaction distances in centimeters for a random sample of 40 college students were obtained. Shorter distances indicate quicker reactions. Each student tried the experiment both with his or her dominant hand, and with his or ...The table shows the prices of identical groceries at 7-Eleven and at Vons. a. Test the hypothesis that the mean price at 7-Eleven is more than the mean price at Vons, at the 0.05 level. Assume that the sampling is random and ...Coin Flips You flip a coin 100 times and get 58 heads and 42 tails. Calculate the chi-square statistic by hand showing your work, assuming the coin is fair. Repeat the chi-square test (all four steps) from Exercise 10.23, but this time assume that you got exactly 20 outcomes in each of the six categories. Refer to the figure. Explain. The table shows the results of a two-way table of gender and whether a person is happy in his or her marriage, according to data obtained from a General Social Survey. Happiness of Marriage X Respondent's Sex Cross ...Post your question