Homework Sourse1 State the critical values for a t test using a twotailed t
1.
State the critical value(s) for a t test using a two-tailed test at a .05 level of significance: t(20).
±1.725
±2.093
±2.086
±0.687
2.
In a sample of 30 participants, a researcher estimates the 95% CI for a sample with a mean of M1-M2= 0.7 and an estimated standard error for the difference (SM1-M2) of 0.2. What is the confidence interval at this level of confidence?
95% CI 0.4, 1.0
95% CI 0.5, 0.9
95% CI 0.3, 1.1
There is not enough information to answer this question.
3.
The more that scores in each group ________, the larger the error variance.
do not overlap
overlap
are significant
are dependent
4.
A researcher reports that the mean difference in the body weight of rats following a pharmacological versus control treatment is 14 grams, with a pooled sample variance equal to 256. What is the effect size for this test using estimated Cohen\'s d?
d = 0.06; small effect size
d = 0.08; small effect size
d = 0.88; large effect size
There is not enough information to answer this question.
5.
Is a one-sample t test reported differently for one-tailed and two-tailed tests?
No, the same values are reported.
It depends on whether the results were significant.
Yes, only significant results for a two-tailed test are reported.
It can be reported differently when the effect size is large.
6.
A researcher compares differences in mean health scores between students at a two local high schools. Assuming that the population variance is unknown, what type of t test is appropriate for this study?
one-sample t test
two-independent sample t test
There is not enough information to answer this question.
7.
Eta-squared is computed ______ for the one-sample, and the two-independent sample t tests.
Differently
Infinitely
Similarly
Semantically
| a) | ±1.725 | |
| b) | ±2.093 | |
| c) | ±2.086 | |
| d) | ±0.687 |
Solution
1. ±2.086
2. 95% CI 0.3, 1.1
3. are significant
4. There is not enough information to answer this question.
5. It depends on whether the results were significant.
6. two-independent sample t test
7. Similarly
