Question: Zinfandel wanted to develop a 90 percent confidence for the average weight of the new class. She figured the standard deviation of their weights was

Zinfandel wanted to develop a 90 percent confidence for the average weight of the new class. She figured the standard deviation of their weights was approximately 15 pounds. She wanted the confidence interval to be of the form "plus or minus 3 pounds." How large a sample should she take?

GPA GMAT Mean 3.3333 672.0000 Standard Error 0.0651 7.8550 Median 3.3 670 Mode 3.1 670 Standard Deviation 0.3565 43.0237 Sample Variance 0. 1271 1851.0345 Kurto sis -0.5483 1.2295 Skewness -0.3666 0.7384 Range 1.3 180 Minimum 2.5 600 Maximum 3.8 780 Sum 100 20160 Count 30 30 Confidence Level(95.0%) 0.1331 16.0653

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