PLEASE DONT ANSWER UNLESS YOU ANSWER ALL 3 PARTS..... THANKS IN ADVANCE Homework

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PLEASE DONT ANSWER UNLESS YOU ANSWER ALL 3 PARTS.....

THANKS IN ADVANCE

Homework: HW 2 Save Score: 0 of 1 pt 35 of 41 (29 complete) Score: 64.77%, 26.56 of 41 pts 10.2.6 Question Help Suppose IQ scores were obtained for 20 randomly selected sets of twins. The 20 pairs of measurements yield x-99.19, y 98.3, r-0.909, P-value 0.000, and y =-6.24 + 1 .05x, where x represents the IQ score of the twin born first. Find the best predicted value of y given that the twin born first has an IQ of 108? Use a significance level of 0.05. Click the icon to view the critical values of the Pearson correlation coefficient r The best predicted value of ý is Round to two decimal places as needed.) Enter your answer in the answer box and then click Check Answer.

Explanation / Answer

Sum of X = 110
Sum of Y = 88
Mean X = 10
Mean Y = 8
Sum of squares (SSX) = 110
Sum of products (SP) = 44

Regression Equation = = bX + a

b = SP/SSX = 44/110 = 0.4

a = MY - bMX = 8 - (0.4*10) = 4

= 0.4X + 4

Sum of X = 25
Sum of Y = 73
Mean X = 2.5
Mean Y = 7.3
Sum of squares (SSX) = 28.5
Sum of products (SP) = -31.5

Regression Equation = = bX + a

b = SP/SSX = -31.5/28.5 = -1.10526

a = MY - bMX = 7.3 - (-1.11*2.5) = 10.06316

= -1.10526X + 10.06316

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