Oven thermostats were tested by setting them to 250 °C and measuring the actual temperature of the oven. In a sample of 67 thermostats, the average temperature was 248.2 °C. Assume the population standard deviation is 5.1 °C. i) Find the 90% confidence interval for the mean oven temperature in °F, wherein F=1.8C + 32. What is the confidence level of the interval (475 °F, 480 °F)? іїї) A 90% confidence interval for the mean temperature is (473 °F, 482 °F). The following statement is True or false? "The probability that the mean temperature is between 473 °F and 482 °F is 90%". Justify your answer

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