PSYCH STATS CHAPTER 11
(T/F) The effect size index, d, is not appropriate for one-way ANOVA data.
False
(T/F) To compare two means in an three-group data set, use three t tests.
False
(T/F) Two effect size indexes, f and d, are appropriate for one-way ANOVA data.
False
MStot= MStreat + MSerror is (T or F)...
False
For a one way ANOVA, effect size indexes (d) that qualifies as large are...
0.8 and above
If an ANOVA led to the statement, "p < 05" you can be sure that the data produced an F ratio that is greater than...
1.00 and the tabled value for F at the level of .05
The proper F value from the F table for alpha = .05, for an experiment in which the df were 7 for MStreat and 64 for MSerror, is...
2.17
How many df are there for the numerator and denominator of an F test if there are three groups with ten participants in each?
2; 27
(T/F) In a one-way ANOVA, the total variability is divided into four portions.
False
In order to determine the effect of school size on subsequent academic performance, 20 graduating seniors who had gone on to college were chosen from each of four high schools that had graduating classes of 50, 250, 500 and 2,000. Mean college grade points were calculated for each high school, alpha was set at .05 and an ANOVA was run, producing an F= 2.75. From this you can conclude that....
Ho should be rejected.
What symbol most quickly tells you the number of levels of the independent variable?
K
The larger the population variance, the larger ____ is.
MSerror
The larger the population variance, the larger___ is.
MSerror
df error = ...
Ntot- K
Suppose your data analysis produced an F value of 3.22. The appropriate F value in the F value in the table was only 3.20. You should....
Reject the null hypothesis
If a tabled value of F is 10.00 and the F obtained from the data is only 9.00, you should....
Retain the null hypothesis
Males and females were compared for the mean number of smiles during a five-minute interview. The 30 males' mean was 3.62 and the 24 females' mean was 5.04. An alpha level of .05 was adopted and an F= 4.02 was obtained. What conclusion is appropriate?
The null hypothesis should be retained.
(T/F) A mean square is a sum of squares divided by degrees of freedom.
True
(T/F) A priori tests are those that are planned before an ANOVA is calculated.
True
(T/F) After an ANOVA is calculated and the group means examined, a post hoc test is appropriate.
True
(T/F) Analysis of variance is a null hypothesis statical testing technique.
True
(T/F) The denominator of an F ratio is a variance.
True
(T/F) The numerator of an F ratio is a variance.
True
(T/F) To compare two means in a three-group data set, use a Turkey Honestly Significant Difference test.
True
A group of 36 subjects was equally divided into 3 groups. A Turkey HSD produced a value that led to the conclusion that Mean 1 was significantly larger than Mean 2, p< .05. Which of the following situations would lead to such a conclusion?
X1 = 24, X2 = 14, MSerror = 84
A group of 50 participants was divided equally into 5 groups. A Turkey HSD produced a value that led to the conclusion that Mean 1 was significantly larger than Mean 2, p< .05. Which of the follow situations would lead to such a conclusion?
X1=13, X2=5, MSerror=36
Suppose you found a way to redo a study so that the SSerror was reduced compared to the first time you ran the expirement. The SStreat stayed the same as before. The effect of this will be to...
be more likely to detect population differences if there are any.
If the null hypothesis is true, an analysis of variance determines the probability that the samples...
came from the same populations.
post hoc tests are to a prior tests as...
checking the data analysis for errors is to doing the initial analysis.
The actual amount of difference the independent variable makes is most closely associated with...
effect size
If the null hypothesis is true, mean square___ will be a good estimate of the population variance.
error and treatment
post hoc tests are to prior tests as...
examining data and deciding on tests is to deciding on tests before the data are examined.
For the probability figures in Table F to be accurate, the populations that the samples are drawn from should...
have equal variances
Variance is just another word for...
mean square
What describes a situation for which ANOVA would not be appropriate?
one population variance is larger, on small.
The ANOVA techniques described in Chapter 10 cannot be used to analyze an experiment with...
paired samples design
If an ANOVA with four samples produces a significant F, you can find out which samples are significantly different from the others by...
performing HSD tests
Turkey Honestly Significant Difference tests is a _____ test.
post hoc
Which phrase does not belong... planned comparison a limited number of comparisons a priori post hoc
post hoc
"All of the samples in the study came from populations with identical means" is a statement of....
the null hypothesis
MSerror will be a good estimate of the population variance...
when the null hypothesis is false.
