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The president of a company that manufactures air conditioners is considering switching his supplier of condensers. SupplierA,the current producer of condensers for the manufacturer, prices its product 5% higher than supplier B does. Because the president wants to maintain his company's reputation for quality, he wants to be sure that supplier B's condensers last at least as long as supplier A's condensers.
After a careful analysis, the president decided to retain supplierAif there is sufficient statistical evidence that supplier A's condensers last longer, on average than supplierB'scondensers. In an experiment, 15 randomly-selected midsize cars were equipped using type-A condensers while another 15 randomly-selected midsize cars were equipped with type-B condensers. The number of kilometers (in thousands) driven by each car before the condenser broke down is displayed in the table below.
SupplierA SupplierB156 109146 7593 131152 13180 129111 147107 78118 124115 86125 127108 11197 146142 114160 136102 98
Carry out a hypothesis test, at 5% significance level, to determine whether the president should retain Supplier A.
We wish to compare the average sales in two shops, to see if the population mean of the first one is higher than the second one. One shop had 100 sales averaging $94, with a standard deviation of $40.
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