= Homework: 9.2 D The following data represent the pH of rain for a random sample of 12 rain dates. A normal probability plot suggests the data could come from a 4.80 population that is normally distributed. A boxplot indicates there are no outliers. Complete parts a) through d) below 5.20 5.72 4.38 5.02 4.59 4.74 5.19 4.87 4 76 4.56 5.71 Click the icon to view the table of critical t-values. (a) Determine a point estimate for the population mean. A point estimate for the population mean is (Round to two decimal places as needed.)