Question

sample of 64 observations is selected from a normal population. The sample mean is 215, and the population standard deviation is 15. Conduct the following test of hypothesis using the 0.025 significance level. H0: μ ≥ 220 H1: μ < 220 Is this a one- or two-tailed test? One-tailed test Two-tailed test

Answer 1

This is a one-tailed test.

Step-by-step explanation:

A single population mean hypothesis test is being conducted in this scenario. The null hypothesis is that the population mean (μ) is greater than or equal to 220, while the alternative hypothesis is that μ is less than 220. Since the alternative hypothesis is written as μ < 220, this is a one-tailed test because we are only interested in the possibility of the population mean being less than 220.