The regression equation Credits = 15.4 - .07 Work was estimated from a sample of

Question

The regression equation Credits = 15.4 - .07 Work was estimated from a sample of 21 statistics students. Credits is the number of college credits taken and Work is the number of hours worked per week at an outside job. (a) Choose the correct statement. A decrease in the number of hours worked per week decreases the expected number of credits. An increase in the number of hours worked per week decreases the expected number of credits. An increase in the number of hours worked per week increases the expected number of credits. (b) Choose the right option. The intercept is meaningful as a student may not have a job outside of school. The intercept is not meaningful as a student who works outside may not earn any credits. (c) If Work = 0, then Credits = 15.4. If Work = 40, then Credits = 12.6.

Explanation / Answer

a) An increase in number of work hours per week decreases the expected number of credits

b) The intercept is meaningful as a student may not have a job outside of school

c) If work = 0, credit = 15.4

If work = 40, credit = 15.4 - 0.07x40 = 12.6

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