Question

An automobile dealer conducted a test to determine whether the time needed to complete a minor engine tune-up depends on whether a computerized engine analyzer or an electronic analyzer is used. Because tune-up time varies among compact, intermediate, and full-sized cars, the three types of cars were used as blocks in the experiment. The data (time in minutes) obtained follow.

Car
		Compact	Intermediate	Full Size
Analyzer	Computerized	50	55	63
	Electronic	42	44	46

1. Show the estimated regression equation (to 1 decimal, if necessary).
   
   = ( ) + ( )  x ₁ +( )   x ₂ +( )   x ₃
2. What is the value of the t test statistic for the type of analyzer (to 2 decimals)? Use α = .05 to test for any significant differences.
   

Answer 1