' Let's refer back to the company that is investigating two types of hearing protection devices to decrease the effective noise level experienced by its employees, either earmuf'fs or foam earplugs. The earmuffs are considerably more expensive, and the president now wants to know at the 0.05 level of significance whether this expenditure has resulted in a change in the variability of effective noise level. The sample results are shown below: Ear Protection Type Mean Effective Noise Level (dB) Number of Observed Employees Estimated Standard Deviation of Noise Level Earmuffs 72 12 15 Foam Earplugs 64 15 19 What is the value of the test statistic? Record your answer to three places after the decimal point (e.g. X.XXX). What is the p value for the test statistic? Record your answer to three places after the decimal point (e.g. X.XXX)