Several studies have found that the frequency with which shoppers browse Internet retailers is related to the frequency with which they actually purchase products and/ or services online. Here are data showing the age of respondents and their answer to the question “How many minutes do you browse online retailers per week?”
Age ........ Browsing Time (min/ wk)
22 ........ 492
50 ........ 186
44 ........ 180
32 ........ 384
55 ........ 120
60 ........ 120
38 ........ 276
22 ........ 480
21 ........ 510
45 ........ 252
52 ........ 126
33 ........ 360
19 ........ 570
17 ........ 588
21 ........ 498
a) Make a scatterplot for these data.
b) Do you think a linear model is appropriate? Explain.
c) Find the equation of the regression line.
d) Check the residuals to see if the conditions for inference are met.