The following data were collected during a study of consumer buying patterns:

   

Observation	x	y	Observation	x	y
1	11	77	8	23	78
2	30	77	9	10	69
3	44	82	10	19	70
4	34	84	11	23	87
5	47	92	12	19	90
6	42	93	13	32	91
7	32	79

   

a.	Obtain a linear regression line for the data.(Round your intermediate calculations and final answers to 3 decimal places.)

  y =  +  x

b.	What percentage of the variation is explained by the regression line? (Do not round intermediate calculations. Round your answer to the nearest whole percent. Omit the "%" sign in your response.)

c.

Approximately  % of the variation in the dependent variable is explained by the independent variable.

d.	Use the equation determined in part b to predict the expected value of y for x = 43. (Round your intermediate calculations and final answers to 3 decimal places.)