Question: The number of machine breakdowns per month was recorded for 9 months on two identical machines, A and B, used to make wire rope: a.

The number of machine breakdowns per month was recorded for 9 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 .05.
b. Can you think of a reason the breakdown rates for the two machines might vary from month to month?

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