Saturday
April 18, 2015

Homework Help: math check

Posted by tom9 on Friday, June 21, 2013 at 9:17pm.

While writing an article on the high cost of college education, a reporter took a random sample of the cost of new textbooks for a semester. The random variable x is the cost of one book. Her sample data can be summarized by the following. (Give your answers correct to two decimal places.)
n = 21, x = 3635.6, and (x - x)2 = 9750.4

(a) Find the sample mean, x.
$ 173.12 .

(b) Find the sample standard deviation, s.
$ 22.08 .

(c) Find the 90% confidence interval to estimate the true mean textbook cost for the semester based on this sample.
Lower Limit $164.30 .
Upper Limit $ 181.94

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Math check - While writing an article on the high cost of college education, a ...
statistics - 2. The director of admissions at a large university advises ...
statistics - Describe whether the following study would most likely be ...
statistics - 1. The on-campus housing costs for a semester at a state university...
epoka university - 1) The cost that is related to the particularly cost object ...
math,algebra,help - Problem states: Business and finance. The cost of producing ...
business and finance - The cost of producing a number of items x is given by C=...
accounting - # 1 Takers,Inc.provide the following results: 2004 2003 Units 2,400...
Math - Let x be a random variable representing the monthly cost of joining a gym...
math - I did the first part how would i graph it. Problem: Business and finance...

Members