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QUESTION 4 Answer the following questions given that the mean weekly quiz score for a class is 72 with a standard deviation of 8 . a. Calculate the z-score that corresponds 70. QUESTION 5 Answer the following questions given that the mean weekly quiz score for a class is 72 with a standard deviation of 8. Calculate the z-score that corresponds 90. QUESTION 6 Answer the following questions given that the mean weekly quiz score for a class is 72 with a standard deviation of 8. Use the z-score table to determine the percentage of people that earned between 70 and 90 on the weekly quiz. (just type the numeric answer, do not type "9%") QUESTION 8 Question 8-11: The data given represents the number of hours playing video games and the GPA of a group of students. When necessary, round your answer using three decimal places. Hours (x ) 0 0.5 1 1.5 2.0 2.5 3.0 GPA (y) 4.0 3.9 3.9 3.7 3.8 3.5 3.0 (a) Calculate the linear correlation coefficient by using the given formula r = n(Exy) - Ex . Ey Vn ( X x2 ) - ([ x) 2 . Jn([yz ) - ([y)2 QUESTION 9 (b) (i) What does the calculated linear correlation coefficient in part (a) mean (within 10 words); AND (ii) What conclusion you can draw from that (within 20 words)? TTTT Paragraph 3 (12pt) X D D Q 3 7 fx > Mashups . 1 4@ Path: p Words:0QUESTION 10 (c) Using the data from question 8 and the given formula, the line of the best fit is given by y=mx+b where m = - n(Exy) - Ex . Ey n([ x2) -([x)2 and b - Ly - m . Ex n Find m. QUESTION 11 (d) Using the data from question 8 and the given formula, the line of the best fit is given by y=mx+b where m = - n(Exy) - Ex . Ey n(Ex2) - ([x)2 and b = zy - m . Ex n Find b . Match each correlation with the appropriate graph. Positive Correlation a b. a) O No Correlation a b C. Negative Correlation a b C 4 OOO 8 b) O 4 8 4 C) O O 4 8 O 2 O 2 4 6