a. Steps to create a scatter plot to identify the best model by using a graphing utility.

1. Set the window of the scatter plot as

2. Use table graph feature and enter the corresponding tabular values as shown below: Here denote the age of smokers and denote the monthly insurance rates for $100,000 life insurance policy.

35	17.32	43	23.71
36	17.67	44	25.11
37	18.02	45	26.60
38	18.46	46	28.00
39	19.07	47	29.40
40	19.95	48	30.80
41	21.00	49	32.55
42	22.22	50	34.47