Sufficient evidence that power expenditure for Question 15
The manufacturer of shoes wants to test whether a small price reduction is enough to increase sales
of their product. Randomly chosen data on 15 weekly sales totals at outlets in Arusha before the price
reduction show a sample mean of Tshs. 6,598,000 and a sample standard deviation of Tshs.844,000.
A random sample of 12 weekly sales totals after the small price reduction gives a sample mean of
Tshs. 6,870,000 and a sample standard deviation of Tshs.669,000. Is there statistical evidence that
the small price reduction is enough to increase sales of shoes?