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A instructor believes that the average quiz score is a good predictor of final exam score. A random sample of 10 students produced the following data where x is the average quiz score and y is the final exam score.
x 86 95 50 65 98 55 85 70 75 85
y 85 96 60 63 96 60 83 60 77 87
(a) Find an equation of the least squares regression line. Round the slope and y-intercept value to two decimal places. Describe method for obtaining results. Show all work; writing the correct equation, without supporting work, will receive no credit.
(b) Based on the equation from part (a), what is the predicted final exam score if the average quiz score is 80? Show all work and justify your answer.
(c) Based on the equation from part (a), what is the predicted final exam score if the average quiz score is 40? Show all work and justify your answer.
(d) Which predicted final exam score that you calculated for (b) and (c) do you think is closer to the true final exam score and why?
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