Problem Set #3
Name: _
Psyc 2300 Dane
Grade _/25
Multiple Choice
1. A scatterplot shows a set of data points that are clustered close to a line that slopes down to the right.
Which of the following values would be closest to the correlation for these data
Problem Set #4
Name: _
Psych 2300, Dane
Grade:_out of 25 points
Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
_
1. For the z test, the critical region for rejection of H0 _.
a. is determined o
Practice questions for exam #1
1. Calculating the variance and standard deviation for the following 2 samples of scores:
A)
4
9
11
15
17
22
s2 = 40.4
s = 6.3560
B)
4
9
11
13
13
15
17
22
s2 = 28.857
s= 5.3719
What do you notice about the two variances? Why
Practice Quiz #2
1.
T
F
If SSy is 50 and SSresidual is 10, then SSregression would be 60.
2.
T
F
If the standard error of the estimate is large then r2 must also be large.
3.
T
F
If you would reject the null hypothesis with alpha = .01 you will always
rej
Practice Questions Quiz #3
1.
T
F
Changing the level of significance from .01 to .05 increases the risk
of a Type I error.
2.
T
F
Post Hoc tests are done after an ANOVA to determine how much
treatment effect there is.
3.
T
F Rejecting the null hypothesis
Problem Set #5
Name: _
Psych 2300, Dane
Grade:_out of 25 points
Please put all of your FINAL answers on the sheets provided and do not attach additional work (except for
SPSS results)
Multiple Choice
Identify the letter of the choice that best completes t
Covariance (Sxy)
Definitional Formula
sxy =
[( X Mx )(Y My )]
n 1
Computational formula
sxy =
XY
( X)( Y)
n 1
n
Sum of Products of deviations (SP)
SP = [( X Mx )(Y My )]
Correlation (rxy)
rxy =
population = ( rho )
S XY
SP
or
or
S X SY
SS X SSY
Computati
Due Week 2
Print Name:_
Problem Set # 1
Psych 2300, Dr. Dane
Score:_out of 25 points
Please show ALL work.
For the following two experiments identify the population, sample, independent variable, and
dependent variable. Try to be as specific as possible.
Problem Set 2
Psych 2300, Dane
Print Name:_
Score:_out of 25 points
Please show all work. Please attach additional pages to the assignment if you need
them and make sure you staple them. For this assignment, round final scores to 2
decimal places (except
Steps for hypothesis testing (two tailed test):
1. State your null and alternative hypotheses. (done in terms of population parameters)
H0 : = 70 (herbs do not affect memory)
H1 : 70 ( herbs do affect memory)
2. State your (alpha) level and your decision
One-Factor
ANALYSIS OF VARIANCE (ANOVA)
The analysis of variance compares two variances: First, the variance of the sample means and, second, the
variance of the scores within samples. Each of these, it turns out, should estimate the population variance o
Psychology 2300 Exam 3 Review
Lecture 9A
> Samples vs. Populations
> Samples consist of the part of the population we actually sample and for which we actually have
data.
> Populations refer to the entire group of individuals in which we are interested bu