Refer to the graphs on this page for part (a) and (b) of question 4. [On all these graphs, the horizontal scale is in $10,000.] P 15 30 45 60 75 90 Q 0 15 30 45 60 75 90 R 0 15 30 45 60 75 90 S 0 15 30 45 60 75 90 [Question 4 starts on next page]0n the previous page are some graphs. (The horizontal scales are in $10,000.) Use those graphs as appropriate for question 4. 4. Another aspect of the pandemic is the economic effect on personal income. The distribution of annual incomes for the population of all adults is strongly right-skewed. The US. Federal Reserve Board will randomly sample some adults. and will compute the average income I' for the sample. 4 (a) 4th) 4 (0) Suppose the Federal Reserve Board selects a random sample of 4 adults. If the study were conducted over and over, a total of 50,000 times (selecting 50,000 different random samples of 4 adults each time assume the sampling is with replacement), the distribution of the average incomes for the many samples would best resemble which graph on the previous page? Give the letter (P, Q, R, or S) of the best graph from the previous page. [4 9:51 Suppose, instead, that the Federal Reserve Board selects a random sample of 1200 adults. If that study were conducted over and over, a total of 50,000 times (selecting 50,000 different random samples of 1200 adults each time assume the sampling is with replacement), the distribution of the average incomes for the many samples would best resemble which graph on the previous page? Give the letter (P, Q, R, or S) of the best graph from the previous page. [4 pts] If, as described in part b, the Federal Reserve Board selects a random sample of 1200 adults, and if that study were conducted over and over, a total of 50,000 times (selecting 50,000 different random samples of 1200 adults each time assume the sampling is with replacement), the name of the distribution of the average incomes for the many samples would be which of the following? Give the letter (T, V, W, or X} of the best answer: [3 pts} T: Population distribution. V: Data distribution. W: Sampling distribution of f for sample size 50,000. X: Sampling distribution of i for sample size 1200. [Turn to exercise 5]