Question

1. Questions 21 through 25 refer to the following output:

   ∑x = 210        ∑x2 = 2870     ∑xy = -10745
   ∑y = -759   ∑y2 = 62523
   Regression Equation:  = 5.873684 – 4.173684x
   Source	SS	df	MS	F
   Regression	11548.06053	1	11584.06053	9.42011
   Error	22134.88947	18	1229.716
   Total	33718.95	19

   21. How many observations were used in the above regression?

1 points   

QUESTION 22

1. What percentage of the observed variability in Y is explained by X?

1 points   

QUESTION 23

1. What is the correlation between X and Y?

1 points   

QUESTION 24

1. Give the value of the t statistic for testing whether the slope between X and Y is zero.

1 points   

QUESTION 25

1. What's the predicted value of Y when X is 9?

Answer 1

21) observations were used in the above regression =19+1 =20

22) percentage of the observed variability in Y is explained by X =r²*100

=( 11548.06053/ 33718.95 )*100 =34.25%

23) orrelation between X and Y = -0.5852

24) value of the t statistic = -sqrt(F)= -3.069

25)

predicted value = 5.873684 – 4.173684*9=-31.6895