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...

Show the appropriate rejection region for a given level of significance
when the variance of the population is assumed to be unknown.

Extracted text: 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 water. A pH below 7.0 is acidic, while 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 the 16 random water samples, the mean and standard deviation were found to be x = 7.6 and s = 0.4. Use a = 0.05, two – tailed. Does the figure below correctly illustrate the critical regions? SITUATION rejection region H, Non-rejection region rejection region H, 0.025 (1 - a) 15 computed t= -4 -2131 2.131 CLAIM EVIDENCE REASONING