Letter grade system (A, B, C, D, F) is an example of a(n) __________ scale of asurement.

• a) nominal
• b) ordinal
• c) interval
• d) ratio

1- A group of first-year college students were recruited to participate in the research on the effect of pandemic isolation on academic performance. The independent variable is _____________________.

• a) number of years in college
• b) academic performance
• c) pandemic isolation
• d) the group of first year student

2- A psychologist observed a group of ten toddlers and determined that children behavior is affected by parental style. The dependent variable is _____________________.

• a) parental style
• b) number of toddlers
• c) a group of toddlers
• d) children behavior

3- PSY 215A psychologist observed a group of ten toddlers and determined that children behavior is affected by parental style. Ten toddlers in this research is NOT a _________.

• a) sample
• b) statistic
• c) population
• d) both a and b

4- In the population of drivers, the mean number of traffic violations in the last 10 years is 5.2. In a random sample of 300 drivers, the mean number of moving violations is 4.25. The difference between 5.2 and 4.25 is due to _______.

• a) a statistical error
• b) a parametric error
• c) a sampling error
• d) better driving skills among the drivers in the sample

5- Letter grade system (A, B, C, D, F) is an example of a(n) __________ scale of asurement.

• a) nominal
• b) ordinal
• c) interval
• d) ratio

6- Letter grade system (A, B, C, D, F) is an example of a(n) __________ scale of asurement.

• a) nominal
• b) ordinal
• c) interval
• d) ratio

7- In a sample of n = 4, three subjects have scores that are 1 point above the mean each. The 4th subject's score must be

• a) 1 point above the mean
• b) 1 point below the mean
• c) 3 points above the mean
• d) 3 points below the mean

8- A z-score of z = -3.00 indicates that the raw score occupies what position in a distribution?

• a) 3 points above the mean
• b) 3 standard deviations above the mean
• c) 3 points below the mean
• d) 3 standard deviations below the mean

9- For a population with = 300 and = 120, what is the z-score corresponding to X = 180?

• a) -0.25
• b) -0.50
• c) -1.00
• d) -5.00

10

If a distribution with a = 500 ms and = 100 ms is converted into a distribution of z-scores. By definition, the z-score distribution's mean and standard deviation will be, respectively:

• a) 100 and 50
• b) 1.00 and 0.00
• c) 100 and 10
• d) 0.00 and 1.00

11- You have a score of X = 55 on an exam. Which set of parameters would give you the best grade on the exam?

• a) = 70 and = 20
• b) = 70 and = 10
• c) = 60 and = 10
• d) = 60 and = 20

12- What proportion of a normal distribution is located in the tail above z = 2.00?

• a) 0.9772
• b) 0.0228
• c) 0.4772
• d) 0.0456

13-

By selecting a smaller alpha level, a researcher is ______.

• a) making it harder to reject H0
• b) better able to detect a treatment effect
• c) increasing the risk of a Type I error
• d) All of the above

14- A two-tailed hypothesis test is being used to evaluate a treatment effect with = .05. If the sample data produce a z-score of z = -0.43, then what is the correct decision? a) Reject the null hypothesis and conclude that the treatment has no effect. b) Reject the null hypothesis and conclude that the treatment has an effect. c) Fail to reject the null hypothesis and conclude that the treatment has no effect. d) Fail to reject the null hypothesis and conclude that the treatment has an effect.

15- As sample size increases, what happens to measures of effect size such as r2 and Cohen's d?

• a) They also tend to increase.
• b) They tend to decrease.
• c) They tend to be unaffected.

16- Which of the following sets of data is most likely to produce a significant repeated-measures t statistic?

• a) M for D = 1 and SS = 10
• b) M for D = 1 and SS = 100
• c) M for D = 10 and SS = 10
• d) M for D = 10 and SS = 100

17-

Suppose the correlation between the amount of salt consumed daily and blood pressure is +0.73. What percentage of the variability in weight can be accounted for by the relationship with height?

• a) 80%
• b) 61%
• c) 53%
• d) 77%

18-

For an analysis of variance comparing three treatments with n = 5 in each treatment, what would df for F-test?

• a) 2, 12
• b) 3, 15
• c) 3, 12
• d) 2, 15

19

1. Each experiment compares three treatment conditions, and each experiment uses separate samples of n = 10 for each treatment.

Experiment C Treatment
1	2	3
M = 1	M = 10	M = 20
s = 1	s = 2	s = 2

Experiment D Treatment
1	2	3
M = 1	M = 2	M = 3
s = 10	s = 12	s = 15

Just looking at the data - without doing any calculations, which MS between is smaller?

• a) Experiment D
• b) Experiment C
• c) They are the same
• d) Cannot determine

20- Below are Means for 2x2 ANOVA. Which missing value would result in no main effect for Stress levels.

	Low Stress	High Stress
Female	10	6
Male	8	?

• a) 6
• b) 10
• c) 12
• d) 8

21-

The following table shows the results of an analysis of variance comparing three treatment conditions with a sample of n = 5 participants in each treatment. Note that several values are missing in the table. What is the missing value for the F-ratio? (Fill in the blank for F) Source SS df MS Between 20 F = _____________ Within Total 44_____

22-

A researchers want to look at the relationship between number of vaccination and the COVID positive cases in NYC. Which hypothesis test she/he would use?

• a) Correlation
• b) Independent- measures t test
• c) One way ANOVA
• d) Repeated measure t test

23 - A researcher wants to compare the mean different between 2 types of exercises (hot yoga and Pilates) on students' stress level between male and female. Which hypothesis test she/he would use?

• a) Correlation
• b) Independent- measures t test
• c) Two Factor ANOVA
• d) Repeated measure t test

24- Prof. Lopez wants to know whether that is any impact on 5th grade students' understanding of the learning materials by assign them two different types of homework on the same learning topic. Which hypothesis test she/he would use?

• a) Correlation
• b) Independent- measures t test
• c) One way ANOVA
• d) Repeated measure t test2
• 25- A searcher wants to examine what is the best dose of the vitamin D on cognitive function on the experimental rat. The researcher has giving the vitamin D (0.5mg, 1mg and 1.5mg) for different groups of the experimental rat. Which hypothesis test she/he would use?
• a) Correlation
• b) Independent- measures t test
• c) One way ANOVA
• d) Repeated measure t test