Choosing Distributions You plan to construct a confidence interval for the population mean μ. Use…

Choosing Distributions You plan to construct a confidence interval for the population mean μ. Use the given data to determine whether the margin of error E should be calculated using a critical value of (from the normal distribution), a critical value of (from a t distribution), or neither (so that the methods of Section 7-3 and this section cannot be used).a. n = 9,  = 75, s = 15, and the population has a normal distribution.b. n = 5,  = 20, s =  2,  and the population has a very skewed distribution.c. n = 12,  = 98.6, ?? =0.6  and the population has a normal distribution. (In reality, is ??  rarely known.)d. n = 75,  = 98.6, ?? =0.6  and the population has a skewed distribution. (In reality, is rarely known.)e. n = 12,  = 98.6, s =0.6  and the population has a skewed distribution.

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