Suppose you need to compute a 90% confidence interval for a population mean. a. If you assume the population variance is 10, what is the minimum sample size needed to create a confidence interval that is no larger than 1 unit wide (±1/2 units)? b. If you assume the population variance is 20, what is the minimum sample size needed to create a confidence interval that is no larger than 1 unit wide (±1/2 units)? c. If you assume the population variance is 20, what is the minimum

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