Question

w e Using a 1-distribution table or software or a calculator, report the statistic which is multiplied by the standard error to form the margin or error forto a. 95% confidence interval for a mean with 15 observations b. 95% confidence interval for a mean with 25 observations c. 90confidence interval for a mean with 25 observations 1 Click the icon to view the distribution tablo a.t= Round to three decimal places as needed)

Answer 1

	given data	excel function	answers
a).95% ci for a mean with 15 observations	df= (n-1) = (15-1) = 14 $\alpha$ = (1-0.95) = 0.05	=T.INV.2T(0.05,14)	42.145
b).95% ci for a mean with 25 observations	df= (n-1) = (25-1) = 24 $\alpha$ = (1-0.95) = 0.05	=T.INV.2T(0.05,24)	-2.064
c).99% ci for a mean with 25 observations	df= (n-1) = (25-1) = 24 $\alpha$ = (1-0.99) = 0.01	=T.INV.2T(0.01,24)	43797

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