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.

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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