A parachute company sells safety devices that are designed to fire, releasing the reserve parachute, at a mean height of 335.2 m with a standard deviation of 12.1 m. The company recently updated the devices and has asked you to perform a hypothesis test to find if the standard deviation, o, has decreased. To do so, you measure the firing heights for a random sample of 20 of the updated devices. These heights have a sample standard deviation of 9.4 m. Under the assumption that the updated device firing heights follow a normal distribution, you will perform a chi-square test. Find 7, the value of the test statistic for your chi-square test. Round your answer to three or more decimal places. 7-0 Espaol