Espao The scatter plot shows the time spent studying, r, and the midterm score,

Question

Espao The scatter plot shows the time spent studying, r, and the midterm score, y, for each of 25 students. Midterm score 610 1214 16 1s Time spent studying (in hours) Use the equation of the line of best fit, y-3.90x+ 15.40, to answer the questions below Give exact answers, not rounded approximations. (a) What is the predicted midterm score for a student who n doesn't spend any time studying? (b) For an increase of one hour in the time spent studying, what is the predicted increase in the midterm score? (c) What is the predicted midterm score for a student who studies for 12 hours?

Explanation / Answer

y = 3.90x + 15.40

a) predicted mid term score for student who doesnt spend any time studying

y = 3.90 (0) + 15.40

y = 15.40

b) for an increase of 1 hour

y = 3.90 (1) + 15.40

y = 19.3

c) for 12 hours

y = 3.90 (12) + 15.40

y = 62.2

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