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 $\mu \neq 10,000 . \text { Use } \alpha = , 10$