4, the population mean is 26, the sample size is 50, and the population standard deviation is 6, we can calculate the test statistic using the formula:
\[ Z = \frac{\bar{X} - \mu}{\frac{\sigma}{\sqrt{n}}} \]
\[ Z = \frac{27.4 - 26}{\frac{6}{\sqrt{50}}} \]
\[ Z =
Show moreā¦