stats -confidence intervals

Jun 27th, 2015
Price: $5 USD

Question description

A county is considering raising the speed limit on a road because they claim that the mean speed of vehicles is greater than 45 miles per hour.  A random sample of 25 vehicles has a mean speed of 48 miles per hour and a standard deviation of 5.4 mph. Find the 95% confidence interval for the speed limit. 

  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) jameskorth
School: Cornell University

Studypool has helped 1,244,100 students

Review from student
" Wow this is really good.... didn't expect it. Sweet!!!! "
Ask your homework questions. Receive quality answers!

Type your question here (or upload an image)

1819 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