# What is the value of the estimate of the common variance?

Nov 29th, 2014
FratBro23
Category:
Statistics
Price: \$5 USD

Question description

A lab scientist is interested in whether lab rats that grow up alone grow as large as lab rats that grow up with other rats around them to play with. He randomly selects 10 young rats with approximately the same age and size. Five of these will spend the next four monthsalone and the other five rats will each have three other rats to play with during the same time. After four months, the scientist measures the abdomen circumference of all the rats (in mm). The results are shown below:

 Alone group (#1) 110 123 113 103 120 Play group (#2) 119 125 131 128 136

The sample means and sample standard deviations are

= 113.8 and s1 = 7.98,  = 127.8 and s2 = 6.38

The sample standard deviations are fairly close in value. Based on these estimates, it is reasonable to assume that the two population variances are equal.

What is the value of the estimate of the common variance?

(Top Tutor) Daniel C.
(997)
School: Boston College

Studypool has helped 1,244,100 students

## 8 Reviews

Summary
Quality
Communication
On Time
Value
ddg82
Dec 6th, 2016
" Thanks, good work "
kenmwao2
Nov 23rd, 2016
" Solid work, thanks. "
tinytim47
Nov 23rd, 2016
" Wow this is really good.... didn't expect it. Sweet!!!! "
jestin7
Nov 14th, 2016
" This tutor is great! "
lilmoe415
Oct 31st, 2016
" Thank you, Thank you, for top quality work, this is your guy!! "
dontuwannaknow
Oct 9th, 2016
" Excellent work as always thanks so much "
thargrow
Sep 30th, 2016
" Very Satisfied. "
SjSurvivor143
Sep 25th, 2016
" Thanks for the help. "

1824 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