TutorTeddy.com, Tutoring, Dallas, TX
Welcome to TutorTeddy.com


Statistics Help




Ask any Statistics/Probability/Math or Any homework Question




Question: The National Center for Education Statistics reported that 47% of college students work to pay for tuition and living expenses. Assume that a sample of 450 college students was used in the study.

1) Provide both a 95% and a 99% confidence interval for the population proportion of college students who work to pay for tuition and living expenses.  Edit

Answer: 1) p =0.47
n = 450
z_c= 1.96 at 95% confidence.

margin of error, E = sqrt(pq/n)*z_c
= sqrt(0.47*(1-0.47)/450)*1.96
= 0.0461

95% CI = (p - E, p + E)
= (0.47 - 0.0461, 0.47 + 0.0461)
= (0.4239, 0.5161) (Ans.)  Edit

TutorTeddy.com & Boston Predictive Analytics

[ Email your Statistics or Math problems to tutor@aafter.com (camera phone photos are OK) ]


Boston Office (Near MIT/Kendall 'T'):
Cambridge Innovation Center,
One Broadway, 14th Floor,
Cambridge, MA 02142,
Phone: 617-395-8864


Dallas Office (Near Galleria):
15950 Dallas Parkway,
Suite 400,
Dallas, TX 75248,
Phone: 866-930-6363

Copyright 2011 tutorteddy.com. All Rights Reserved. | By using our site, you agree to our TOS.