## Statistics in Psychologist Assignments

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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

11. A researcher records the level of attention among 18 students during an interactive and lecture portion of a single class. If she computes a related sample t test at a 0.05 level of signiﬁcance (two-tailed test), then what is the critical value for this test?

±1.734

±1.740

±2.110

±2.101

12. A researcher computes the mean difference in locomotion in a sample of 12 rats before and 30 minutes after an injection of amphetamine. Rats were placed in a box with infrared beams. The number of times rats crossed the beams was used as a measure of locomotion. The mean difference in locomotion was 6.2 ± 8.4 (MD ± SD), and this difference was signiﬁcant. What is the effect size for this result using Cohen’s estimated d?

d = 0.74 (medium effect) d = 1.36 (medium effect) d = 0.74 (large effect)

d = 1.36 (large effect)

13. A researcher reports with 90% conﬁdence that 31% to 37% of Americans believe in ghosts. What is the point estimate for this interval?

31%

34%

37%

31% to 37%

14. In a sample of 20 participants, a researcher estimates the 95% CI for a sample with a mean of M = 5.4 and an estimated standard error (SM) of 1.6. What is the upper conﬁdence limit for this interval?

2.1

3.8

7.0

8.8

15. There is no difference between a point estimate and an interval estimate.

True False

16. Using a between-subjects ANOVA design, n · k participants are each observed one time n participants are observed k times

data are not analyzed between groups the same participants are observed in each group

17. A researcher measures attractiveness ratings of a male confederate among 30 women who were told the confederate was either single, dating, or married (n = 10 per group). What are the degrees of freedom for error for the one-way between-subjects ANOVA?

2

3

27

28

18. A researcher measures differences in romantic feelings among adolescent and adult males. If different participants were in each group, then what type of statistical design is appropriate for this study? a two-independent sample t test a one-way between-subjects ANOVA a two-way between-subjects ANOVA both a two-independent sample t test and a one-way between-subjects ANOVA

19. Which of the following post hoc tests is associated with the greatest power to detect an effect?

Schaffé test Tukey’s HSD test Bonferroni test Fisher’s LSD test

20. A researcher computes a one-way within-subjects ANOVA in which k = 4 and n = 20.

What are the degrees of freedom error for this test? 57

79

80