ch.11 post test
If the estimated standard error of this study is 0.61, what is the t score for this sample?
-4.92
With an independent-samples t test, you will usually compare the difference of sample means to ______.
0
Consider a study in which the sum of squares (SS) based on an experimental group of 15 participants is 100, and the SS based on a control group of 31 participants is 250. The estimated standard error of this study is ______.
0.89
What is pooled variance for this sample?
3.61
Consider a study in which the sum of squares (SS) based on an experimental group of 10 participants is 70, and the SS based on a control group of 20 participants is 50. The pooled variance of this study is ______.
4.29
You have a total of 90 participants in your independent-samples study. Your degrees of freedom would be ______.
91
What would NOT be the reasonable alternative hypothesis for this study?
Men would shop as much as women in the population.
In this study, can we assume the homogeneity of variance?
We cannot assume the homogeneity of variance in this study.
A research design where one group is tested in one conditions and another group is tested in another condition is called ______.
between-subjects design
If Group A consists of 150 people and Group B consists of 5, the pooled variance will be ______.
closer to the estimated population variance of Group A
One important difference between a paired-samples t test and an independent-samples t test is the way we calculate the ______.
estimated standard error
The denominator of the t score formula for the independent-samples t-test is ______.
estimated standard error
What is the appropriate conclusion from this study (α = .05)?
fail to reject the null hypothesis
Part of conducting an independent-samples t test is using difference scores that are found for each participant.
false
Since we have two samples in a study, we will have two estimated standard errors to calculate.
false
We must account for the unequal sample sizes in calculation of the difference of sample means.
false
When you have means from two different samples, it is best to conduct ______.
independent samples t test
In independent-samples t test, you calculate the ______ first, then calculate the ______.
sample means; difference of the means
A psychologist hypothesizes that the children with type-K personality score higher than the children with type-R personality on an memory test. The estimated standard error turned out to be 0.9, while the mean score of type-K children was 18.8 and the mean score for type-R children was 21.3. What is the t score?
t = (18.8-21.3)/0.9 = -2.78
What is the critical t score for this sample assuming that it is a one-tailed test with 0.05 α-level? (use the closest degrees of freedom)
tcrit = 1.697
All of the following statements are true about independent-samples t tests EXCEPT ______.
they can be used when the sample means are unknown
In which research question below would you use a t test for independent means?
to compare the scores on an optimism measure between two universities
SPSS automatically tests for the homogeneity of variances when you conduct an independent-samples t test.
true
The hypothesis testing process is the same for one-sample and independent-samples t tests.
true
What is the appropriate t-sample for this study?
tsample = 1.862
