An Ink Cartridge for a Laser Printer Is Advertised to Print

Essay

An ink cartridge for a laser printer is advertised to print an average of 10,000 pages. A
random sample of eight businesses that have recently bought this cartridge are asked to
report the number of pages printed by a single cartridge. The results are shown. $\begin{array} { l l l l } 9771 & 9811 & 9885 & 9914 \\ 9975 & 10,079 & 10,145 & 10,214 \end{array}$
Assume that the data belong to a normal population. Test the null hypothesis that the mean number of pages is 10,000 against the alternative hypothesis $\mu \neq 10,000$ . Use $\alpha = .10$ .