Learning Task 3.2: Think Critically! Directions: Identify and graph the critical value of each given problem. Shade the rejection region and sketch the curve on a separate sheet of paper. 1. A survey reports the mean age at death in the Philippines is 70.95 years old. An agency examines 100 randomly selected deaths and obtains a mean of 73 years with standard deviation of 8.1 years. At 1% level of signicance, test whether the agency's data support the alternative hypothesis that the population mean is greater than 70.95. critical value = _ n = a = tailed test: test statistic: _ 2. The mean time costumer waits in line before checking in a grocery chain is less than 10 minutes. To verify the performance of the store, the obtaining mean time of 25 costumers is 9.5 minutes with standard deviation of 1.6 minute. Use these data to test the null hypothesis that the mean time is 10 minutes, at 0.01 level of signicance. critical value = n = a = tailed test: test statistic: _ Learning Task 3.1: What Is My Value? Directions: Find the critical value of the following: left-tailed test, o known , a = 0.05, n = 34 Answer: two-tailed test, o unknown ,