# Statistics for Psychology - Practice Test

This test is based off of UTSC's PSYB07 Stat's midterm exam for Fall 2013. The questions are written in a more challenging and applicative way to encourage some open book use. Good luck

If you have any discrepancies please message me on the PSYB07 page on facebook and I can talk or work through some of the answers. If I got any wrong then I'm sorry but I am only human lol

Created by: Marco

1. To say something is without bias is to say it is _____
2. If you have a child, the child can be either a male or a female. Though your second child can be either male or female and doesn't depend on the first child's gender. The former is known as ____ and the latter as _____
3. If you have a set of score that are too low for your liking and you decide to multiply each score by a constant of 3, what must you do to the variance?
4. Probabilities require events to be Independent, but in the case of additive laws, they also require events to be:
5. Bayes Theorem's applicative law of probability states that P(A|B) =
6. A population has a mu = 13.4, N = 550, and a variance of 64. You draw a sample of 16 from the population and discover it has a mean of 14.2 and you end up with a variance of 55. What is the Standard Error?
7. The null hypothesis assumes that:
8. You conduct a study where your mean attains a z-score of 1.22 on the comparison distribution, you used a two tailed test (p < 0.05). What do you conclude?
9. I asked you to rate your favorite movies from most favorite as #1 all the way to #5. What type of variable am I using?
10. Here is a frequency table showing score on the left and frequency on the right: 0 | 0 1 | 2 2 | 4 3 | 6 4 | 8 5 | 5 6 | 2 7 | 2 8 | 1 9 | 0 What is the a) mean b) standard deviation
11. There is a controversy in using the mean to describe research. Many psychologists have proposed to:
12. Explain what is meant by Central Limits Theorem
13. What are criticisms of using a normal curve as a comparison distribution in studies?
14. Please put the 5 steps of hypothesis testing in chronological order: a) determine cutoff comparison distribution b) restate question as research hypothesis and null hypothesis c) determine sample score on comparison distribution d) determine characteristics of comparison distribution e) decide whether to reject the null hypothesis or not
15. The 2009 APA (6th ed.) now requires research papers to include:
16. If you have a population mean, and you take samples of the population many times, having a set of sample means. When you get the mean of all the sample means, it will equal:
17. When figuring out the z score of a mean compared to the distribution of means, you minus the mean of the distribution of means FROM the mean you are trying to find the z-score of, and then divide over what?
18. Marginal significance occurs when a z-score comes very close to the cutoff z-score (such as z = 1.94 and the cutoff is 1.96). Psychologists and statisticians generally:
19. You have done a study and just calculated the confidence interval of your sample distribution (using SEM because there are two population means). You compare your confidence interval with the general population (comparison distribution) and notice your confidence interval does not contain the population's mean (null hypothesis). With this, what can you conclude?
20. You've employed a study technique to help students get a better grade on the PSYB07 midterm. You randomly select 22 students to participate. After the midterm, the class average was 64 with a standard deviation of 9. Your study group scores an average of 67 with a standard deviation of 6. What is the effect size?
21. Increasing which of the following does not, in turn, increase power, but lower it?
22. The most acceptable level of power is?
23. What can you do to artificially raise power, but what are the consequences?
24. Which area of psychology research are you most likely to find a higher emphasis on the use of Effect Sizes in research articles?
25. Sample 1: mean = 6, N = 4 Sample 2: mean = 8, N = 2 Sample 3: mean = 5, N = 3 Sample 4: mean = 7, N = 3 What is the Harmonic Mean?
26. What is the probability of making a Type II error
27. A new disease called Tuition Sickness (TS) has appeared in the population. The probability of TS is 0.001. If you have TS, you have a 0.99 probability of testing positive. However there is a 0.0002 chance of testing a false positive. You go to your school's Health and Wellness center to be tested for TS and it turns out positive. What are the chances you ACTUALLY have TS given you just tested positive?
28. A school has 200 students (pretty small, isn't it). 70% are men. 50% are women. 50% are blond, 50% are brunette. What is the probability to select a blond male?
29. A more abstract question to challenge you. In a group you can either be A or B, and you can also be either C or D. 80% are B's. 40% of the population are also C's. What is the chance of finding an A whose also a C?
30. You're conducting a study. You want to have a large effect size (0.80). In your study you know there is a population mean of 56 and a standard deviation of 8. So you draw a sample of 10 for your experimental procedure and assume to reject the null hypothesis on a two tailed distribution at a p

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