Several studies have found that the frequency with which shoppers browse Internet retailers is related to the frequency with which they actually purchase productsand/or services online. The data in the accompanying table show the age of respondents and their answer to the question"how many minutes do you browse online retailers perweek?" Complete parts a through d.

Age 21 50 44 33 55 59 38 22 21 45 51 33 20 17 21

Browsing Time (min/wk) 492 186 179 384 121 120 276 481 510 252 126 361 570 589 498

O 800 O 800 Br. Ti. (minsk) 300 O 800 Br. Ti. (mindk) 300- 800 85 Br. Ti. (minsk) 300- 15 40 85 Age Br. Ti. (minsk) 300- 15 40 15 40 85 Age 15 40 85 Age Age