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a major research organization conducted a national survey to determine what percent of Americans feel that things are getting better for them economically . Asking 1,200 residents called at random if their own economic situation was better today than last year, 45% reported that they were in fact better off than before. Estimate the standard error of the mean , find the 95% confidence interval for the population mean, find the 99% confidence interval for the population mean.
Sagot :
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