Example 5 A random sample of size 30 is taken from a population with standard deviation 2.2. The mean of the sample is 18.3 a
Example 5 A random sample of size 30 is taken from a population with standard deviation 2.2. The mean of the sample is 18.3 a State the importance of the central limit theorem in finding a confidence interval for u. b Find a 90% C.I. for the population mean /. c What size sample is required to obtain a 90% C.I. with a width of at most 1?
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