15.27 Machine Breakdowns The number of machine breakdowns per month was recorded for nine months on two identical machines, A and B, used to make wire rope:

a. Do the data provide sufficient evidence to indicate a difference in the monthly breakdown rates for the two machines? Test by using a value of a near 0.05.

b. Can you think of a reason the breakdown rates for the two machines might vary from month to month?

Transcribed Image Text:

-234160m 5 Month A B 1 3 14 7 7 12 2252 9 10 15 9 12 6 6 7 13 12 8 6 5 9 7 13