From several years worth of experience, workers at a particular ford company assembly plant in cleveland have determined that it takes, on average, 7 minutes to complete a particular task. they are not sure, however, of the variance. their supervisor, however, believes that the standard deviation is 30 seconds. suppose that the workers take a random sample of 16 cars and calculate the sample standard deviation, s, to be 25.65 seconds and want to test the following hypothesis: h0: f2 = 900h1: f2 is not? 900use the following information to perform the appropriate test using a 5% significance level. relevant information: we showed in class that an unbiased estimator for the population variance, f2 is the sample variance, s2. it turns out that the expression: [(n-1)s2/ f2] follows a chi-squared distribution (p2) with n - 1 degrees of freedom. at the 5% level of significance, and for 15 degrees of freedom, the upper and lower p2 critical valuesare: 6.262 and 27.488.