Question: x = 40, n = 50, 95% level. a. Use the one-proportion plus-four z-interval procedure, as discussed on page 449, to find the required confidence

x = 40, n = 50, 95% level.
a. Use the one-proportion plus-four z-interval procedure, as discussed on page 449, to find the required confidence interval.
b. Compare your result with the corresponding confidence interval found in Exercises 11.17–11.22, if finding such a confidence interval was appropriate.

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