A random sample of size 20 taken from a normally distributed population revealed a sample mean of 87.7 and a sample variance of 49.4. The
A random sample of size 20 taken from a normally distributed population revealed a sample mean of 87.7 and a sample variance of 49.4. The upper limit of a 95% confidence interval for the population mean would equal: O a. 90.1030 O b. 90.9784 O c. 90.4174 O d. 90.9894
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