The Human Relations Department of Electronics, Inc., would like to include a dental plan as part of the benefits package. The question is: How much does a typical employee and his or her family spend per year on dental expenses? A sample of 45 employees reveals the mean amount spent last year was $1,820, with a standard deviation of $660.
(a)
What are the endpoints of a 95 percent confidence interval for the population mean. (Round your answers to the nearest dollar amount. Omit the "$" sign in your response.)
I got 1627 & 2013 but the answer was wrong. Please help !!
(a)
What are the endpoints of a 95 percent confidence interval for the population mean. (Round your answers to the nearest dollar amount. Omit the "$" sign in your response.)
I got 1627 & 2013 but the answer was wrong. Please help !!
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VANNiiERRz
Try 1622 and 2018
CI = 1820 +/- (2.015)(660) / sqrt 45 = 1622 to 2018
where 2.015 is from the t-table with 0.05/2 = 0.025 in each tail using 44 d.f.
hope that helped
Try 1622 and 2018
CI = 1820 +/- (2.015)(660) / sqrt 45 = 1622 to 2018
where 2.015 is from the t-table with 0.05/2 = 0.025 in each tail using 44 d.f.
hope that helped