Quiz 5
In a one-way ANOVA, a participant's score is +4 units from the value of GM. Additionally, her score is -1 unit from her group's mean (M). How far from the GM is the M?
+5 units
If x has SD^2 of 23.78 and y has SD^2 of 17.56, what is the standardized variance of x?
1.00
If a person has an IQ of 130, approximately what percentage of people have higher IQ? Assume m= 100 and o= 15
2%
When figuring the variance of the distribution of means based on an estimated population variance in a sample ith N=20. You divide the estimated populaiton variance by ________.
20
You are computing an independent means t test and find that s^2(pooled) = 250, if both N1 and N2 = 25, what is s^2(difference)?
20
A consumer psychologist is interested in the effects of Annual income and motivations to shop on shopping patterns of consumers. If Annual income (broken into two levels: High and Moderate) and Motivation to shop (with three levels: Escape, Necessity, and Socializing) are considered in one study, how many cells will there be?
6
Failing to reject the null hypothesis when the research hypothesis is true is referred to as
A Type 2 error
Each of following is part of conducting a t test for independent means except
A differece score is figured for each participant
In a factorial design, a "cell"is
A particular combination of levels of the variables that divide the groups
The Scheffe test is
A post-hoc comparison procedure
The test performed after the omnibus test in a one-way ANOVA with three levels of the independent variable to determine precisely where the differeces occurred is called
A post-hoc test
If you havge two sample of 15 people each, how many degrees of freedom will you have in you independent means t test ?
B. 28
In a factorial analysis of variance, df(w) can be calculated by
Both A and C
As compared to a t test for independent means, an analysis of variance
Can be used in any situation in which a t test for an independent means would be used, but a t test for independent means can not be used in all situations in which an analysis of variance would be used.
B is the probability that
If the research hypothesis is true, the experiment would still fail to support it.
In day to day life, people informally formo and test hypothesis. For example, one might wonder if attending every class causes students to get good grades, or if it's that the variation between students (i.e. Individuals differences) is more important, regardless of whether they attend class or not? In this example, the variation between individuals is
Is analogous to within-group variance
In a 2x2 factorial ANOVA, you are testing
One interaction and two main effects
If your research hypothesis states that there is a difference between the means of thee samples, you carry out a(n) ________ to test the null hypothesis that three populations have equal means.
One-way ANOVA
Analyzing the data for your study requires that you complete a one-way ANOVA, which you do in SPSS. The output gives you an observed significance value of .032. Seeing this, you
Reject the null hypothesis
For a one-way ANOVA, SS(total) = ____________+ SS(between)
SS(within)
When computing an independent means t test, you find that s^2 m1 = 14.58 and s^2 m2 = 12.36. Based on this finding, you know that
Sample 2 has a larger N than Sample 1
The median is greater than the mean in a distribution that is:
Skewed to the left
Suppose that you are interested in the relation between number of years working for a particular company and loneliness at work. You survey 40 workers at his company and figure a croeelation between these two variables of .90. This is considered a
Strong negative linear correlation
When conducting an analysis of variance, when the null hypothesis is true, then all of the following are true. Except
The F ratio will generally be much larger than 1
A "distribution of differences between means" can be thought of as a distribution of
The differences you get when you repeatedly subtract a sample mean from one population from a sample mean from another population
Statistics Student Susie is asked to find the most representative value for data containing income levels for the residence in her hometown. What value should she use?
The median
In a 2x2 analysis of variance, the degrees of freedom for each main effect are
The numberof levels of the variable minus 1
In a one-way ANOVA the sum of (x-m)^2 + the sum of (M-GM)^2
The sum of (x-gm)^2
The sum of the squared deviations of each score from the mean of its group plus the sum of the squared deviations of each's group mean from the grand mean equals
The sum of squared deviations of each score from the grand means
One important advantage of using effect sizes is that
They are standardized score, making study to study comparions easier
The core idea of one way ANOVA is
To think of each score in terms of its deviation from the overall mean being divided into two parts
A 2x2 factorial design has
Two variables that divide the groups
Setting the significance level cutoff .10 instead of the more usual .05 increases the likelihood of
Type I error
In an F ratio, the denominator is always the _______ -group estimates of the populaiton variance
Within
Beta is the probability that
if the research hypothesis is actually true, the experiment would still fail to support it
two-way factorial design
is "two-way" because there are two variables that divide the groups whose influence is being studied
One characteristic of an F ratio is
it is never less than 0.
When figuring the pooled population variance estimate in a t test for independent means,
the estimates based on each of the samples are averaged in such a way as to give more influence to the estimate based on more participants
When the cell means of a factorial dersign study are graphed. If the patterns of bars on one section of the graph are different from the pattern on the other section
there is an interaction effect.