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Oven thermostats were tested by setting them to 350 degrees F and measuring the actual temperature of the oven. In a sample of 67 thermostats, the average temperature was 348.2 degrees F and the standard deviation was 5.1 degrees F.

a.) Find a 90% confidence interval for the mean oven temperature.

b.) Find a 95% confidence interval for the mean oven temperature.

c) What is the confidence level of the interval (347.5, 348.9)?

d) How many thermostats must be sampled so that a 90% confidence interval specifies the mean to within + 0.8 degrees F?

e) How many thermostats must be sampled so that a 95% confidence interval specifies the mean to within + 0.8 degrees F?

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Category:- Statistics and Probability
Reference No.:- M91109991

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