Statement of a problem № m40274


A random sample of size 20 yields  = 3.13 and s2 = 1.45. Calculate a confidence interval for the population mean whose confidence level is as follows: a. 0.99 b. 0.98 c. 0.95 d. 0.90 e. 0.80 f. What assumptions were necessary to establish the validity of the confidence intervals calculated in parts a through e?

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