Confidence interval and sample size

Price: $5.00 USD

Document Description

Includes example on how to calculate saple size and confidence interval for mean and population proportion

Written By

Studypool Tutor
NU wants to estimate the mean time spent by its students commuting daily to campus. Thepopulation standard deviation time spend commuting is 8 minutes. A random sample of 49 studentsreveals a mean of 20.5 minutes.a. Construct a 99 percent confidence interval estimate for the population mean time spent by NUstudents commuting daily to campus?b. Within 99 percent confidence, what sample size is needed if NU wants to be within (+/-) 1 minuteof the true population parameter?Please explain and show work (including graphs if necessary).1.Confidence interval = mean EMargin of error (E) = z critical * sigma/ nE = 2.575 *8/ 49E= 2.943Confidence interval = 20.5 2.943=(17.557, 23.4432.N= (Z*/ E)^2N= (2.575* 8/1)^2N= 424.36=4253.NU wants to estimate the proportion of its 1,000 student athletes that play sports during the summerbreak. If a random sample of 100 st
lock_open Buy Document

Reviews from Students

Studypool Student
"Solid work, thanks. "
Ask your homework questions. Receive quality answers!

Type your question here (or upload an image)

1820 tutors are online

Brown University





1271 Tutors

California Institute of Technology




2131 Tutors

Carnegie Mellon University




982 Tutors

Columbia University





1256 Tutors

Dartmouth University





2113 Tutors

Emory University





2279 Tutors

Harvard University





599 Tutors

Massachusetts Institute of Technology



2319 Tutors

New York University





1645 Tutors

Notre Dam University





1911 Tutors

Oklahoma University





2122 Tutors

Pennsylvania State University





932 Tutors

Princeton University





1211 Tutors

Stanford University





983 Tutors

University of California





1282 Tutors

Oxford University





123 Tutors

Yale University





2325 Tutors