A head librarian supervises a number of libraries in a large county. He wants to know...

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A head librarian supervises a number of libraries in a largecounty. He wants to know if full-time library workers and part-timelibrary workers re-shelve books at the same rate. So, he checks therecords of 45 full-time library workers and finds that theyre-shelve an average of 166 books per hour with a standarddeviation of 9.3 books per hour. The records of 45 part-timelibrary show that they re-shelve an average of 159 books per hourwith a standard deviation of 12.2 books per hour.
Using a level of significance of Î±=.01, is there enough evidenceto indicate a difference in the mean number of books re-shelved byfull-time workers compared to part-time workers?
please be detailed in telling how to locate the z= 1.645 and z=-1.645

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SolutionState the hypotheses The first step is tostate the null hypothesis and an alternative hypothesisNull hypothesis u1 u 2Alternative hypothesis u1 u2Note that these hypotheses constitute a twotailed testFormulate an See Answer

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