statstics
posted by Anonymous .
construct a 90 confidence interval for the population mean ÃŽ¼. assume the population has a normal distribution. A sample if 15 randomly selected math majors has a grade point average of 2.86 with a standard deviation od 0.78. Round to the nearest hundredth

90% = mean ± 1.645 SEm
SEm = SD/√n
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