PAM 2100
Instructor: Salam Abdus
Problem Set #1 Answer key
Total: 10 points
Circle all of your final answers.
Put your name and your section number at the top.
#1) “Conservationists have despaired over destruction of tropical rainforest by logging,
clearing, and burning.”
These words begin a report on a statistical study of the effects of
logging in Borneo.
Researchers compared forest plots that had never been logged (Group
1) with similar plots nearby that had been logged 1 year earlier (Group 2) and 8 years
earlier (Group 3).
All plots were 0.1 hectare in area.
Here are the counts of trees for
plots in each group:
Group
1
27
22
29
21
19
33
16
20
24
27
28
19
Group
2
12
12
15
9
20
18
17
14
14
2
17
19
Group
3
18
4
22
15
18
19
22
12
12
a)
Draw a separate stemplot for each group.
(1.5 points)
Ans. See attached sheet. 0.5 points for each correct stemplot.
b) Calculate the mean and standard deviation for group 1. (Round the mean to two
decimal places.
Use this number to calculate the standard deviation.
Round the standard
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
This is the end of the preview.
Sign up
to
access the rest of the document.
 Fall '08
 ABDUS,S.
 Standard Deviation

Click to edit the document details