An electrical engineer wishes to compare the mean lifetimes of two types of transistors in an application involving high-temperature performance. A sample of60 transistors of type A were tested and were found to have a mean lifetime of 1827 hours and a standard deviation of 168 hours. A sample of 180 transistors of type B were tested and were found to have a mean lifetime of 1658 hours and a standard deviation of 225 hours. Find a 95% confidence interval for the difference between the mean lifetimes of the two types of transistors.

What will be an ideal response?


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If there are 10 processes that might be improved, the processes that should be worked on first are those which will yield the most benefit if improved.

Where is the capillary tube of the thermostatic control switch positioned?

A. In the air stream of the evaporator B. Deep inside the evaporator coil C. Deep inside the condenser coil D. To the evaporator outlet pipe

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In a semi-hermetic compressor, _____

a. the compressor and drive motor share a common housing b. the drive motor is mounted outside of the compressor housing c. the pistons can easily be accessed and serviced in the field d. any component failure can be addressed without replacing the compressor

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If the diameter of a piston is 178 millimeters (mm), find the area of the top of the piston to the nearest tenth square millimeter.

A. 24,750.3 B. 24,884.6 C. 24,966.9 D. 24,973.0

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