Consider the following hypotheses: H0: μ ≥ 220 HA: μ < 220 A sample of 72 observations results in a sample mean of 209. The population standard deviation is known to be 18. a-1. Calculate the value of the test statistic. Note: Negative value should be indicated by a minus sign. Round final answer to 2 decimal places. a-2. Find the p-value. multiple choice 1 0.05 p-value < 0.10 p-value 0.10 p-value < 0.01 0.01 p-value < 0.025 0.025 p-value < 0.05 b. Does the sample evidence enable us to reject the null hypothesis at α = 0.10? multiple choice 2 Yes since the p-value is less than the significance level. No since the p-value is greater than the significance level. No since the p-value is less than the significance level. Yes since the p-value is greater than the significance level. c. Does the sample evidence enable us to reject the null hypothesis at α = 0.01? multiple choice 3 Yes since the p-value is less than the significance level. Yes since the p-value is greater than the significance level. No since the p-value is less than the significance level. No since the p-value is greater than the significance level. d. Interpret the results at α = 0.01. multiple choice 4 We conclude that the population mean is less than 220. We cannot conclude that the population mean is less than 220. We conclude that the population proportion differs from 220. We conclude that the population proportion equals 220.