Wednesday

August 20, 2014

August 20, 2014

Posted by **TOM95** on Wednesday, June 19, 2013 at 11:19pm.

n = 21, Óx = 3635.6, and Ó(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 $

Upper Limit $

I can not get the limits to work out I have tried 4 times and I only have one more time. I have plugged information into calculator that worked on other limits but not this one.

**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 - 1. The on-campus housing costs for a semester at a state university...

math - You are the buyer for your university bookstore. One of the textbooks has...

Math - How can you classify the 2 examples that you gave in part c? Is it: ...

final exam - a study shown that 20% of all college textbooks cost at least $70....

Math - Let x be a random variable representing the monthly cost of joining a gym...

Algebra 1 - Can you please check my work? A city planning committee surveys 100 ...

MATH Prob. - Determine whether the situation calls for a discrete or continuous ...

random sampling - sometimes it is difficult or impossible to determine the ...