Question: Refer back to Example 9.8, page 436. Another sample is taken to estimate the proportion of convertibles. Results are n = 400 and x =

Refer back to Example 9.8, page 436. Another sample is taken to estimate the proportion of convertibles. Results are n = 400 and x = 92 Find:
a. the estimate for the standard error.
b. the 95% confidence interval.

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