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Here's a hint: Use a confidence interval formula for proportions. Here's one example: CI99 = p + or - (2.58)(sqrt of pq/n) ...where sqrt = square root, p = x/n, q = 1 - p, and n = sample size. Remember you need a 90% confidence interval; my example uses a
Here's a few hints: Null hypothesis: Population proportion is equal to some value. Alternative hypothesis: Population proportion is greater than some value. (The problem is asking if the market share increases.) Type I errors result when you reject the

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