A sample of 64 measurements is taken from a continuous population, and the sample mean is found to be 32.0. The standard deviation of the population is known to be 2.4. An interval estimation is to be made of the mean with a level of confidence of 90%. State or calculate the following items.

g. E (maximum error of estimate)
h. Upper confidence limit
i. Lower confidence limit

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a. x b, σ C. d, l-α