A sales manager of a hardware store monitors sales trends in the plumbing section by random sampling 12 sales invoices at the end of each month. Historically, the monthly average sales invoice has been stable at $120. Last month the sample gave an average value of $112.85 with a standard deviation of $20.80. Does this evidence support at the 5% level of significance the contention that the average long term sales invoice value has changed? (Assume that sales invoice amounts are approximately normally distributed.)
Israel: A Blessing to All Nations
“I will make of you a great nation? And you shall be a blessing? And all the families of the earth shall bless themselves by you” (Gen. 12:2-3). Israel is a blessing to the other nations. As long as Israel succeeds in informing other peoples and proving that Yahweh is God, it will be understood […]