A random sample of 200 customers is selected and 35 respond

A random sample of 200 customers is selected and 35 respond yes. In Constructing a 90% confidence interval estimate of the true proportion of the population that would respond yes what value would you use for \"z\"? In Constructing a 90% confidence interval estimate of the true proportion of the population that would respond yes what would be the value of your upper limit of your confidence interval?

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