1.
For a population with a standard deviation of = 10, how large a sample is necessary to
have a standard error that is:
a.
less than or equal to 5 point? N = ( / x) = (10/5) =4
b.
less than or equal to 2 points? N = ( / x) = (10/2) = 25
c.
less than or e
1. The following data summarize the results from an independent-measures study
comparing three treatment conditions.
I
2
3
8
6
5
6
M=5
T=30
SS=24
Treatment
II
5
9
10
13
8
9
M=9
T=54
SS=34
III
8
6
12
11
11
12
M=10
T=60
SS=30
N=18
G=144
X2=1324
A. Use an AN
1.
For a population with = 70 and a standard deviation of = 8,
a.
Find the z-score for each of the following X values.
X = 82
Z=82-70/8
Z= 12/8 =1.5
X = 64
Z=64-70/8
Z= -6/8 = .75
X = 72
Z=72-70/8
Z= 2/8 = .25
X= 54
Z=54-70/8
Z=-16/8 = -2
b.
Find the scor
1. One sample has SS = 48 and a second sample has SS = 32.
A.
If n = 5 for both samples, find each of the sample variances and compute the pooled
variance. Because the samples are the same size, you should find that the pooled variance is
exactly halfway
1. One sample has SS = 48 and a second sample has SS = 32.
A.
If n = 5 for both samples, find each of the sample variances and compute the pooled
variance. Because the samples are the same size, you should find that the pooled variance is
exactly halfway