test z=. ACTIVITY: Identify the test statistic and construct the critical and acceptance regions of the following problems using Central Limit Theorem. 1. A company claimed that their N95 face mask has a mean filtration efficiency rate of 95%. A group of student researcher wanted to verify this claim. They bought and tested 40 of their N95 face masks. They found out that the average filtration efficiency rate of these face mask was 90% with a standard deviation of 4%. Test the claim at 5% level of significance and assume that the population is approximately normally distributed. 2. A certain group of welfare recipients receives relief goods with a mean amount of Php 500 per week. A random sample of 75 recipients is surveyed and found that the mean amount of relief goods they received in a week is Php 600 and a standard deviation of Php50.00. Test the claim at 1% level of significance is not Php 500 per week and assume that the population is approximately normally distributed. This space is for the​