QUESTION 3. [6 marks] Marking researchers have found that the frequency of browsing internet for shoppers is related to

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Question 3 6 Marks Marking Researchers Have Found That The Frequency Of Browsing Internet For Shoppers Is Related To 1 (128.43 KiB) Viewed 31 times

QUESTION 3. [6 marks] Marking researchers have found that the frequency of browsing internet for shoppers is related to the frequency of the purchase of products or services online. To understand the relationship between demographics of customers and purchase of products/services online, a market researcher has collected data on a sample of 7 customers, where x represents age (years) and y represents browsing time (minutes/week). The data are presented in the table below. 20 22 38 52 18 30 Age, x Browsing Time, y 60 80 400 480 280 100 620 320 7 7 7 7 7 Xi = 240, Σκ= , Σ y; = 2280, Xy? = 972000, x} = 9856, = XiYi = 59960 i=1 i=1 i=1 i=1 i=1 (a) Compute and state the least squares regression line for predicting browsing time based on age. (b) Interpret the estimated regression coefficient. (c) Predict the mean number of browsing time at age 40.