Researchers obtained the body temperature of 93 healthy humans and found the average body temperature of these 93 people to be 97.3°F.  Construct a 99% confidence interval for the population mean body temperature of healthy humans. Assume the population standard deviation is 0.63°F.   a)  Is this a z-value or a t-value confidence interval?  (Write z or t.)   b) What is the z-value or t-value?    c) What is the confidence interval? (, ) (Rounded to 2 decimal places.)   d) Interpret this result.

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