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furnace installation company wants to determine whether theres a difference between the installation time(in minutes) of...

furnace installation company wants to determine whether theres a difference between

the installation time(in minutes) of type A and type B furnaces. All of the 12 employees installs

one of each type. The time is recorded and the difference is taken(type A -a type B) with an

average difference of 7.5 and standard deviation of 3.2. Construct a 95% confidence interval for

the average difference of installation time between furnaces. Is there a significant difference in

installation time of the two types?

Math   Statistics-And-Probability   
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