Quantitative Methods in Psychology (formerly COGS/PSYC 0090)
CLPS 0900

Spring 2014
Problem Set #4
8.2:
a.)
Lunch cost
zscore
1
3.75
1
4.00
0
1
4.25
1
b.) No
c.) You spent $4.25 on lunch ($5.00$0.75=$4.25) which is within 1 standard deviation of
the mean. Thus, it is likely that you spent a usual amount of money for lunch, and you
Quantitative Methods in Psychology (formerly COGS/PSYC 0090)
CLPS 0900

Spring 2014
Problem Set #8
9.0
(a)
Null hypothesis:
H0: = 0. There is no relationship between high school GPA and college GPA.
Alternative hypothesis:
H1: 0. There is a relationship between high school GPA and college GPA.
(b)
Significance level: = 0.05, twotailed
D
Quantitative Methods in Psychology (formerly COGS/PSYC 0090)
CLPS 0900

Spring 2014
Problem Set #6
16.1
(a)
Research hypothesis:
H1: At least one of ns, ds, as gm (not all s are equal). The research hypothesis is that
age has an impact on a memory recall task.
Null hypothesis:
H0: All s are equal. The null hypothesis is that age has no i
Quantitative Methods in Psychology (formerly COGS/PSYC 0090)
CLPS 0900

Spring 2014
Problem Set #3
1. a.) To find raw score from zscore, we would apply a linear transformation to the data:
Z=
X
Z + =X
b.)
1.21*100 + 500 = 379
0.38*100 + 500 = 462
0.11*100 + 500 = 489
0.16*100 + 500 = 516
1.53*100 + 500 = 653
c.)
Because we are only l
Quantitative Methods in Psychology (formerly COGS/PSYC 0090)
CLPS 0900

Spring 2014
Problem Set #7
17.1
(a)
This is a 3by2 factorial experiment design (3 levels of Strategy, 2 levels of Delay).
(b)
A reasonable a priori research hypothesis would be that word recall would be better when
subjects utilize the generate own key words strate
Quantitative Methods in Psychology (formerly COGS/PSYC 0090)
CLPS 0900

Spring 2014
Problem Set #5
13.1:
Research hypothesis:
H1: Not all s are equal. The research hypothesis is that the relative sexual satisfaction
within married couples is not the same between husbands and wives.
This test will be twotailed, since the research hypothe
Quantitative Methods in Psychology (formerly COGS/PSYC 0090)
CLPS 0900

Spring 2014
Problem Set #9
19.8
(a)
Null hypothesis:
H0: Fertility does not depend on smoking habits (smoker vs. nonsmoker)
Alternative hypothesis:
H1: Fertility depends on smoking habits (smoker vs. nonsmoker)
(b)
Significance level: = 0.05
Degrees of freedom: df =