How large a sample should the CE take to be 90% confident of his estimate?

Sigchi4life
Category:
Statistics
Price: $5 USD

Question description

A civil engineer wishes to estimate the average completion time of freeway widening projects correct to within 1 month. From previous experiments it is known that the population standard deviation is approximately 6 months. How large a sample should the civil engineer take to be 90% confident of his estimate?

Tutor Answer

(Top Tutor) Daniel C.
(997)
School: New York University
PREMIUM TUTOR
Studypool has helped 1,244,100 students
Ask your homework questions. Receive quality answers!

Type your question here (or upload an image)

1827 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