Question

XIX. (Hint: Recall the work we did for 9.1)

Test score , y	67	85	87	92	98
Student Study Hours, x	3	5	5	7	10

a. Compute r to two decimal places and give a qualitative meaning to r.

b. Compute the coefficient of determination, r2, to two decimal places and state the meaning of r2 in the context of the problem.

c. Write the equation of the Line of Best Fit for the given data. Compute the slope and the y-intercept to two decimal places.

d. Predict the average test score for x=8 hrs of study.

XIX. (Hint: Recall the work we did for 9.1) 92 67 3 85 5 87 5 98 10 7 Test score, y Student Study Hours, X a. Compute r to two decimal places and give a qualitative meaning to r. b. Compute the coefficient of determination, r°, to two decimal places and state the meaning of r² in the context of the problem. c. Write the equation of the Line of Best Fit for the given data. Compute the slope and the y-intercept to two decimal places. EC B: Predict the average test score for x=8 hrs of study.

Answer 1

82 85 92 96 67 Test slove u 5 7 3 10 5 Student study hrowy (X) model, we we R- software to fit the ( - 271-(92-9 NRT² 274 72 Y= 0.9004 gt between that there to very strong direct Yebtions p² = ² neond that by x [0-9004)2 = 0.8107 01:12. of variability of y is explained 9+ ŷ = 62.01 + 3.96 X = 62.01 Intercept term slop 396 6 x=8 given ŷ = 62.01 + 3.96 x 8 93.69