The management of the Delphi Corp. is considering a new method of assembling a carburetor assembly for racing cars. The present method requires an average of 24.0 minutes to assemble a carburetor. The average assembly time for a random sample of 25 carburetors, using the new method, was 20.0 minutes, and the standard deviation of the sample was 5 minutes. Using the .05 level of significance, can we conclude that the assembly time using the new method is faster? Using the hypothesis testing procedure:
State the alternate hypothesis. H1:
You would reject Ho if t is:
What is the calculated t value?
What is your statistical decision on H0?