Calcium is essential to tree growth. In 1990, the concentration of calcium in precipitation in Chautauqua, New York, was 0.11 milligram per liter \( \left(\frac{\mathrm{mg}}{\mathrm{L}}\right) \). A random sample of 8 precipitation dates in 2018 results in the following data: \[ \begin{array}{lllll}0.234 & 0.313 & 0.108 & 0.065 & 0.087 \\ \text { A normal probability plot suggests the data could come from a population that is normally distributed. A boxplot does not show any } \\ \text { outliers. Does the sample evidence suggest that calcium concentrations have changed since 1990? Use the a }=0.01 \text { level of } \\ \text { significance. }\end{array} \] \( \mathrm{t}_{0}=1.41 \) (Round to two decimal placestas needed.) Find the P-value. P-value \( =\square \) (Round to three decimal places as needed.)

The grades on the second statistics test for Mr. Brown's class are in the following list. Find the frequency distribution for the grades. \[ F, C, B, D, D, A, F, B, B, D, F, D, D, B, B, D, B, A, D, F, D \]

The grades on the second statistics test for Mr. Brown's class are in the following list. Find the frequency distribution for the grades. \[ \text { C, D, B, F, B, A, F, F, B, B, B, F, D, B, F, D, F, B, F, B, C } \]

Suppose that grade point averages of undergraduate students at one university have a bell-shaped distribution with a mean of 2.52 and a standard deviation of 0.41 . Using the empirical rule, what percentage of the students have grade point averages that are greater than 3.34 ? Please do not round your answer. Answer How to enter your answer (opens in new window)

Supstion 5 of 19, Step 1 of 1 percentage of American women have shoe sizes that are greater than 9.58 ? Please do not round your answer. Answer How to enter your answer (opens in new window)

Suppose that shoe sizes of American women have a bell-shaped distribution with a mean of 8.06 and a standard deviation of 1.52 . Using the empirical rule, what percentage of American women have shoe sizes that are greater than 9.58 ? Please do not round your answer.