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A railway company used 2 types of wheel mounts that differ in the way they handle...

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Statistics

A railway company used 2 types of wheel mounts that differ inthe way they handle track irregularities: type A and type B. Thefollowing data gives the repair records for 2 types over a 1 yearperiod:

# of cars# needing service
Type A15020
Type B18018

Test for the difference between population proportionsPA and PB.Useα = 0.02.

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