In a grocery parking lot 32 of 136 cars selected at random were white. (a) Construct a 98 percent confidence interval for the true proportion of white cars. (b) May normality be assumed? Explain. (c) What sample size would be needed to estimate the true proportion of white cars with an error of ± 0.06 and 90 percent confidence? With an error of ± 0.03 and 95 percent confidence? (d) Why are the sample sizes in (c) so different?
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