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 businesses that have recently bought this cartridge are asked to report the number of 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 10,000 against the alternative hypothesis μ ≠ 10,000. Use α = .10.