Independent random samples, each containing 800 observations…
Independent random samples, each containing 800 observations, were selected from two binomial populations. The samples from populations 1 and 2 produced 320 and 400 successes, respectively. Construct a 90% confidence interval for the true difference in population proportions of successes. In the interest of time you can assume that the sample sizes are large enough that it is appropriate to use a large-sample confidence interval.