Nate Burrow
Psych440
Dr. Volk
10/14/2012
Homework: Chapter 9
1.
a.
b.
c.
d.
e.
b = .359, b0=47.35 - Y=47.35+.36X
For Women
B = .2854, b0=44.31 - Y=44.31+.2854X
Y=44.31+.2854(72) - 64.9 in.
Zy=.32 (Zx)
Chapter 3: Statistical Significance Testing
1. The Alpha level decides what ranges of values are used for the test statistic. (t ratio or z)
In general the smaller the alpha level, the smaller the cha
Nate Burrow
Psych440
Dr. Volk
10/14/2012
Homework: Chapter 9
1.
a.
b.
c.
d.
e.
b = .359, b0=47.35 - Y=47.35+.36X
For Women
B = .2854, b0=44.31 - Y=44.31+.2854X
Y=44.31+.2854(72) - 64.9 in.
Zy=.32 (Zx)
Nate Burrow
Psych 440
Dr. Volk
9/16/2012
Homework 5
1.
a. 93
b. In the journal they assumed that the two groups had different variances. Whereas
when I calculated the degrees of freedom I assumed they
1. The goals of data screening are:
a. Identification and correction of data errors
b. Detection and decisions about outliers
c. Evaluation of patterns of missing data and decisions with respect to ho
Nate Burrow
Psych 440
Dr. Volk
8/29/2012
Homework #2
1.
a. M = 2
(X-M)
0
1
1
1
2
7
-2
-1
-1
-1
0
5
SUM = 0
(X-M)2
4
1
1
1
0
25
SUM = 32
S2 = 6.4
SD = 2.53
c. No, because the sum of the deviations shou
Homework #1
Psyc440
8/23/2012
A sample is representative if it has characteristics similar to those of the population
1.1 Convenience samples are more commonly reported in journal articles.
1.2 Random
Chapter 6
1-14
1.
a. Stess symptoms purported to be statistically significant with a critical F value of
2.68. Since 3.827 is larger than 2.68, the results are concluded to be statistically
significan
Chapter 4
QUALITY CONTROL FOR DATA COLLECTION
Most methods of data collection are susceptible to recording errors or artifacts, and researchers
need to know what kinds of errors are likely to occur.
R