The scatterplot shows the median starting salaries and the median​ mid-career salaries for graduates at a selection of colleges. Complete parts​ (a) through​ (e) below.

​Mid-Careerequals=negative 8075−8075plus+1.9881.988

Start Med

304050607080255075100125150175Start Median Salary (thousands of $)Mid-Career Salary (thousands of $)

A graph has a horizontal axis labeled "Start Median Salary (thousands of dollars)" from 30 to 80 in increments of 10 and a vertical axis labeled "Mid-Career Salary (thousands of dollars)" from 25 to 175 in increments of 25. A line ascends from left to right and forty points are scattered around the line as it ascends, with approximately half of the points above the line and half below the line. The line travels through the following points: (30, 52), (40, 71), (50, 91), (60, 111), (70, 131) and (80, 151). All points are approximate.

Question content area bottom

Part 1

a. As the data are​ graphed, which is the independent and which the dependent​ variable?

The independent variable is

median starting salary

and the dependent variable is

median mid-career salary.

Part 2

b. Why do you suppose median salary at a school is used instead of the​ mean?

A.

Salary distributions are usually​ bimodal, making the median a more meaningful measure of center.

B.

Salary distributions are usually​ bell-shaped, making the median a more meaningful measure of center.

C.

It is easier to calculate the median for a salary distribution instead of the mean.

D.

Salary distributions are usually​ skewed, making the median a more meaningful measure of center.

Your answer is correct.

Part 3

c. Using the​ graph, estimate the median​ mid-career salary for a median starting salary of

$ 40 comma 000$40,000.

The median​ mid-career salary for a median starting salary of

$ 40 comma 000$40,000

is about

​$71,00071,000.

​(Round to the nearest thousand as​ needed.)

Part 4

d. Use the equation to predict the median​ mid-career salary for a median starting salary of

$ 40 comma 000$40,000.

The median​ mid-career salary for a median starting salary of

$ 40 comma 000$40,000

is about

​$enter your response here.

​(Round to the nearest dollar as​ needed.)