18 only. Can you explain how to find the answer for 18 only.

17. CSI Statistics Police sometimes measure shoe prints at crime scenes so that they can learn something about criminals. Listed below are shoe print lengths, foot lengths, and heights of males (from Data Set 2 "Foot and Height" in Appendix B). Is there sufficient evidence to conclude that there is a linear correlation between shoe print lengths and heights of males? Based on these results, does it appear that police can use a shoe print length to estimate the height of a male? Shoe Print (cm) 29.7 29.7 31.4 31.8 27.6 Foot Length (cm) 25.7 25.4 27.9 26.7 25.1 Height (cm) 175.3 177.8 185.4 175.3 172.7 18. CSI Statistics Use the paired foot length and height data from the preceding exercise. Is there sufficient evidence to conclude that there is a linear correlation between foot lengths and heights of males? Based on these results, does it appear that police can use foot length to esti- mate the height of a male? 19. Lemons and Car Crashes Listed below are annual data for various years. The data are