A company produces electrical devices that are operated by thermostatic control. The standard deviation of the temperature at which these controls actually operate should not exceed 3.5 ° F. A sample of 20 units was chosen randomly from these controls and the standard deviation of the operating temperatures was 3.36 ° F. Test the alternative hypothesis that the standard deviation is greater versus the null hypothesis that the mass standard deviation is 3.5 ° F, at a 10% significance level.   THANKS

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