A business magazine samples 90 individuals responsible for economic forecasting for regional banks. The population is large enough that the with/without replacement distinction doesn’t matter. Suppose that the sample of 90 forecasts yields an average prediction of a 2.7% growth in real disposable income. Assume that the population standard deviation is .4%. Q7. Calculate the lower bound for the 90% confidence interval for the population mean forecast. a) 2.63 b) 2.77 c) 2.90

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