1. A method for testing a claim or hypothesis about a parameter in a population, using data measured in a sample, is called
random sampling
level of significance
hypothesis testing
guessing
2. The one-sample z test is a hypothesis test used to test hypotheses
concerning a single population with a known variance
concerning at least one population
concerning the variance in a population
all of the above
3. Given the following values: μ = 6.0, M = 7.6, n = 36, σ = 6, conduct a one-sample z test at a 0.05 level of significance. For a one-tailed test, upper-tail critical, what is the decision?
to reject the null hypothesis
to retain the null hypothesis
There is not enough information since the sample size is not given.
4. ________ allows researchers to describe (1) how far mean scores have shifted in the population, or (2) the percentage of variance that can be explained by a given variable.
significance
probability
power
effect size
5. The ________ is an inferential statistic used to determine the number of standard deviations in a t distribution that a sample means deviates from the mean value or mean difference stated in the null hypothesis.
t distribution
t statistic
standard error
degrees of freedom
6. State the critical value(s) for the following two-tailed t test at a 0.05 level of significance: t(∞).
±1.645
±1.96
the same as for a two-tailed z test at a 0.05 level of significance
both ±1.96 and the same as for a two-tailed z test at a 0.05 level of significance
7. A researcher reports that the mean time it takes to complete an experimental task is 1.4 ± 8.0 (M ± SD) seconds. If the null hypothesis was that the mean equals 1.0, then what is the effect size for this test using estimated Cohen’s d?
d = 0.05; small effect size
d = 0.50; medium effect size
d = 1.05; large effect size
There is not enough information to answer this question.
8. Computing a two-independent sample t test is appropriate when
different participants are assigned to each group
the population variance is unknown
participants are observed one time
all of the above
9. A researcher has participants rate the likability of a sexually promiscuous person described in a vignette as being male (n = 20) or female (n = 12). The mean likability ratings in each group were 4.0. If the null hypothesis is that there is no difference in likability ratings, then do likability ratings differ at a 0.05 level of significance?
Yes, this result is significant, p < 0.05.
No, this result is not significant, t(30) = 0.
No, this result is not significant, t(30) = 1.00.
There is not enough information to answer this question, because the variance in each sample is not given.
10. A type of related samples design in which participants are observed more than once is called a
repeated measures design
matched pairs design
matched samples design
both matched pairs design and matched samples design
