38) If a population has standard deviation 20 what is the minimum sample size to be 95% confident that the error should be accurate to within 4?/ A) 191 * a 0.05 ES3 B) 10 C) 97 D) 20 39) A previous analysis of paper boxes showed that the standard deviation of their lengths is 11 millimeters. A packer wishes to find the 90% confidence interval for the average length of a box. How many boxes does he need to measure to be accurate within 3 millimeters? A) 14 B) 52 C) 37 D) 23

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A:

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A: