Question: Analysis of the last digits in data sometimes reveals whether the data have been accurately measured and reported. If the last digits are uniformly distributed

Analysis of the last digits in data sometimes reveals whether the data have been accurately measured and reported. If the last digits are uniformly distributed from 0 to 9, then their mean should be 4.5. The last digits in the published numbers of sitting days for federal Parliaments are used to test the claim they come from a population with a mean of 4.5. (The raw data are in Data Set 5 in Appendix B.) If Excel is used to analyze the results, a table similar to the one shown here could be generated. Using a 0.05 significance level, interpret these results.

Mean (Sample) Mean (Null Hyp.) StDev 4.8286 4.5000 2.7277 35 0.4611 0.7135 1.9600 0.4755 Std Error Test Statistic z Critical z P-value

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