stats-confidence intervals

Jun 28th, 2015
FratBro23
Category:
Accounting
Price: $5 USD

Question description

A telecommunications company wants to estimate the mean length of time (in minutes) that 18 to 24 year olds spend text messaging each day.  In a random sample of twenty seven 18 to 24 year olds, the mean length of time spent texting was 29 minutes.  From past studies the  standard deviationis 4.5 minutes.  Find the 90% confidence interval.

  1. Find the critical value

  2. Find the margin of error:  E =

  3. Find the confidence interval: CI =

  4. Write the conclusion.


Tutor Answer

(Top Tutor) Daniel C.
(997)
School: UCLA
PREMIUM TUTOR

Studypool has helped 1,244,100 students

Summary
Quality
Communication
On Time
Value
ddg82
Feb 26th, 2017
" Thanks, good work "
Ask your homework questions. Receive quality answers!

Type your question here (or upload an image)

1828 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