The following data show the number of hours studied for an exam, x, and the grade received on the exam, y (y is measured in 10s; that is y = 8, means that the grade, rounded to the nearest 10 points, is 80).

a. Draw a scatter diagram of the data.
b. Find the equation of the line of best fit and graph it on the scatter diagram. y = 8
c. Find the ordinates that correspond to x = 2, 3, 4, 5, 6, 7, and 8.
d. Find the five values of e that are associated with the points where x = 3 and x = 6
e. Find the variance se2 of all the points about the line of best fit.

Transcribed Image Text:

x 2 3 3 4 4 5 5 6 6 6 7 7 78 8 4 5 2 2 y 5 5 7 5 7 78 6 98 7 9 10 8 9