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In-class Activity 1: Drinking Water Drinking water has become an important concern among people. The quality of drinking water must be monitored as often as possible during the day for possible contamination. Another variable of concern is the pH level, which measures the alkalinity or the acidity of the water. A pH below 7.0 is acidic while a pH above 7.0 is alkaline. A pH of 7.0 is neutral. A water-treatment plant has a target pH of 8.0. Based on 16 random water samples, the mean and the standard deviation were found to be: X = 7.6 and s = 0.4 Does the sample mean provide enough evidence that it differs significantly from the target mean? In other words, does the sample come from a population whose mean / is the same as the target pH of 8.0? Use a = 0.05, two-tailed test. Steps Answer 1. Formulate the hypotheses. (Null & Alternative) 2. Is Central Limit Theorem applicable? (n 2 30) 3. Identify the following: . Significance level for or Two-tailed or one-tailed test Critical value/s 4. Compute the test statistic. X - H X - H 7= or z = 5. Compare the test statistic and the critical value. Decision-making (Reject or Accept Ho) 6. Interpret the result.In-class Activity 2: Five Random Measurements A sample of ve measurements. randomly selected from an approximately normally distributed population. resulted in the summary statistics: 1? = 4.6, s = 1.5. a) Test the null hypothesis that the mean of the population is 6 against the altemative hypothesis y 6.5. Use a = 0.01. 3. Conduct a t-test for the null hypothesis H0 : p: = 100 against the alternative hypothesis H1 : p > 100 based on 15 random observations. The sample mean is 110 and the sample standard deviation is 5. Use a = 0.05