An engineering student wanted to know which factors influence the time (in seconds) for his car to go from 0 to 30 to 0 miles per hour. Factor \(A\) was the launch, which was either no wheel spin or dropping the clutch at 2,500 rpm. Factor \(B\) is either stopping with transmission in neutral or in second gear. Factor \(C\) is the air conditioning off or on.

Summarize the experiment according to the visual procedure. Interpret the effects based on confidence intervals.

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Factor Launch Factor B Transmission Factor C A/C Rep. I Rep. 2 9.43 9.34 -1 8.80 8.52 1 9.17 9.15 8.36 8.43 9.87 9.66 1 8.81 8.92 - -1 1 1 9.56 8.94 1 1 1 8.40 8.46