MATH 1113:

Section 7.2 Homework

Answer each question to the best of your ability. Show your calculations (they can be verified on a calculator). Your final answer should be in the form of a complete sentence.

The following table lists footprint length (in centimeters) and height (in centimeters) of 10 subjects (including both men and women).

Footprint length	27.6	31.8	31.3	31.3	34.5	24.8	28.6	25.4	26.7	26.7
Height	172.7	182.9	189.2	185.4	193.7	165.1	166.4	177.8	167.8	168.3

1. Use either a scatterplot or a calculator to compute the linear correlation coefficient to determine whether is a correlation between the two variables.

2. The first five subjects are all males and the last five are all women. For the males use either a scatterplot or a calculator to compute the linear correlation coefficient to determine whether is a correlation between the two variables.

3. The first five subjects are all males and the last five are all women. For the females use either a scatterplot or a calculator to compute the linear correlation coefficient to determine whether is a correlation between the two variables.

4. Do the preceding results make sense?