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Self - Review 1 8 - 4 The assembly area of Gotrac Products was recently redesigned. Installing a new lighting system and purchasing new workbenches
SelfReview The assembly area of Gotrac Products was recently redesigned. Installing a new lighting
system and purchasing new workbenches were two features of the redesign. The produc
tion supervisor would like to know if the changes resulted in an improvement in worker
productivity. To investigate, she selected a sample of workers and determined the
production rate before and after the changes. The sample information is reported below.
a How many usable pairs are there? That is what is
b Use the Wilcoxon signedrank test to determine whether the new procedures actually
increased production. Use the level and a onetailed test.
c What assumption are you making about the distribution of the differences in production
before and after redesign?
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