Question

In 2003, the Accreditation Council for Graduate Medical Education (ACGME) implemented new rules limiting work hours for all residents. A key component of these rules is that residents should work no more than 80 hours per week. The following is the number of weekly hours worked in 2016 by a sample of residents at the Tidelands Medical Center.

84	80	88	81	83	83	83	83	80	84	81	80

Develop a 90% confidence interval for the population mean. (Use t Distribution Table.) (Round your answers to 2 decimal places.)

Confidence interval for the population mean_____ and _____

Is the company’s claim that the “typical customer” spends 80 per month reasonable?

Yes No

Answer 1

Given :

n = 8

significance level,

= 1-90/100 = 0.1

Confidence interval for the population mean is 81.55 and 84.70

Yes, beacause confidence interval does not contain hypothesized mean