To construct a confidence interval using the given confidence level, do whicheve

Question

To construct a confidence interval using the given confidence level, do whichever of the following is appropriate. (a) Find the critical value za/2, (b) find the critical value ta/2,or (c) state that neither the normal nor the t distribution applies 90%; n = 400; 18.0; population appears to be skewed Click here to view a table of critical t-values, her andar able lick here to vieww Choose the correct answer below. A. t·1/2" 1.966 B. zu/2.2.575 c. w2-1649 D. zu/2-1.645 O E. Neither the normal nor the t distribution applies.

Explanation / Answer

Here population standard deviation is given which is 18.0, population appears to be skewed. But as we are calculating confidence interval for population mean, and n is quite high, the population mean will follow normal distribution.

so Here Z(a/2) = 1.645

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