ex 3 SG
two-independent sample t test
A professor compares final exam scores in his psychology class to final exam grades in another comparable professor's class. Assuming that the population variance of exam scores is unknown, what type of t test is appropriate for analyzing differences between these classes?
Related samples t test
A professor compares scores on a competency exam among students at two times during a single semester. What type of t test is most appropriate for this study?
2.53
A researcher conducts a study in which k=6 and n=6 per group. What is the critical value for the one-way between-subjects ANOVA at a .05 level of significance?
repeated measures design
A type of related samples design in which participants are observed more than once is called a
(All of the Above) different participants are assigned to each group; the population variance is unknown; and participants are observed one time
Computing a two-independent sample t test is appropriate when
conduct post hoc tests
Following a significant one-way between-subjects ANOVA in which k>2, what is the next appropriate step?
The number of factors in the design
For an analysis of variance, the term "one-way" refers to
+/- 2.086
State the critical value(s) for a t test using a two-tailed test at a .05 level of significance:
t statistic
The ____ is an inferential statistic used to determine the number of standard deviations in a t distribution that a sample mean deviates from the mean value or mean difference stated in the null hypothesis.
The population variance must be known
To compute a one-sample t test, a researcher has to know many values. Which of the following is NOT a value that the researcher must know to compute this test?
Equal variances
Which of the following is an assumption for the two-independent sample t test, but not the one sample t test?
3 and 36 degrees of freedom
Which of the following statements is the appropriate way to lead the degrees of freedom for an ANOVA with 10 participants in each of four groups?
Exam scores were significantly higher in the male group, f(18) = 2.12, p <.05
A professor teaches a certain section of material using a lot of examples with sports and cars to illustrate. He is concerned that this my have biased his instruction to favor male students. To test this, he measures exam grades from this section of material among women (n=10). The mean score in the male group was 84 +/- 4.0 (M +/- SD); in the female group, it was 78 +/- 8.0 (M +/- SD) points. If the null hypothesis is that there is no difference in exam scores, then test the null hypothesis at a .05 level of significance.
it increases the variability measured in a study
Each of the following is an advantage for using the related samples design EXCEPT
Sample variance; population variance
The estimated standard error in the t statistic uses the ____ to estimate the _______ when the population variance is unknown.
Increase; smaller
The related samples design can ____ the power to detect an effect by making the standard error ____.
between-groups variability
The source of variability associated with error variance in the one-way between-subjects ANOVA is called
(all of the above) it is associated with greater variability; it is characterized by "thicker" distribution; it is associated with scores being more likely in the tails of the distribution
The t distribution is similar to the z distribution except
the pooled population variance
To compute a two-independent sample t test, a researcher has to know how many values. Which of the following is NOT a value that the researcher must know to compute this test?