what is a 90% confidence interval for the population mean if the sample mean is 20, the sample size is 100 and the standard deviation is 9.8. You should use the fact that 90% of sample means are within 1.66 standard errors of the population mean O a. none of the other options is correct O b. between 18.373200 and 21.626800 O c. between 18.373200 and 27.126800 O d. between 12.873200 and 21.626800

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