A study was run on the relationship between annual income and commute time of Sa

Question

A study was run on the relationship between annual income and commute time of San Francisco workers. The least squares line was found to be 110-08a r where x is annual income in thousands of dollars, and y is minutes of commute. Answer the following questions (a) For every additional thousand dollars of annual income, the average commute time is expected to be shorterby (b) Annual income and commute time are negatively, , linearly correlated for San Francisco workers. (c) What would you predict the commute time to be if a person has an annual income of $60,000? (d) What would you predict the commute time to be if a person has an annual income of $100,000? minutes minutes

Explanation / Answer

a) -0.8

c) x = 60

y = 110 - 0.8(60) = 110-48 = 62

d) x = 100

y = 110 - 0.8(100) = 110 - 80 = 30

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