Using Correct Distribution. In Exercises 1–8, assume that we want to construct a confidence interval… 1 answer below »

Using Correct Distribution. In Exercises 1–8, assume that we want to construct a confidence interval using the given confidence level. Do one of the following, as appropriate: (a) Find the critical value z??2 , (b) find the critical value tα2, (c) state that neither the normal nor the t distribution applies.1. 95%; n = 23; σ is unknown; population appears to be normally distributed.2. 99%; n = 25; σ is known; population appears to be normally distributed.3. 99%; n = 6; σ is unknown; population appears to be very skewed.4. 95%; n = 40; σ is unknown; population appears to be skewed.5. 90%; n = 200; σ = 15.0; population appears to be skewed.6. 95%; n = 9; σ is unknown; population appears to be very skewed.7. 99%; n = 12; σ is unknown; population appears to be normally distributed.8. 95%; n = 38; σ is unknown; population appears to be skewed.

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