Research methods in psychology worksheet with answers

Which measure of spread is the difference between the highest and lowest scores?

1. AThe standard deviation
2. BThe interquartile range
3. CThe variance
4. DThe range

A hypothesis that predicts a difference but does not say in which direction is called:

1. ADirectional (one-tailed)
2. BA null hypothesis
3. CAn operational definition
4. DNon-directional (two-tailed)

A case study is:

1. AAn in-depth investigation of one person, group or event
2. BA survey of thousands of randomly selected people from the general population
3. CA statistical review of many published studies
4. DA laboratory experiment with two conditions

A cross-sectional study compares 20-, 40- and 60-year-olds on technology use at the same time. Which problem may confound the age comparison?

1. ACohort effects
2. BPractice effects
3. CFloor effects
4. DOrder effects

In a normal distribution, approximately what percentage of scores lie within one standard deviation of the mean?

1. A99.7%
2. B50%
3. C95%
4. D68%

In a repeated measures design, order effects can be controlled by:

1. ASingle-blind procedures
2. BUsing a larger sample only
3. CCounterbalancing
4. DRandom sampling

A 2 × 3 factorial ANOVA shows that a drug improves memory in young adults but not in older adults. What has been found?

1. AA floor effect
2. BA Type I error
3. CAn interaction between drug and age
4. DOnly a main effect of age

Which non-parametric test compares two related samples, such as before-and-after scores on an ordinal scale?

1. AIndependent t-test
2. BChi-square test of independence
3. CWilcoxon signed-rank test
4. DMann–Whitney U test