PSYC 354 Final Exam 3

1. What percentage of observations that fall between a z score of -1.47 and a z score of 1.11? 
2. Adam scored 70 on his final exam. His class's average score was 50, with a standard deviation of 10. How many standard deviations is Adam's score from the mean? 
3. The symbol for the population mean is: 
4. Study Description: Dance Dance Revolution 
5. In one statistics course, students reported studying an average of 9.92 hours a week, with a standard deviation of 4.54. Treating the class as the population, what is the percentile for a student in the class who studies 10 hours a week? 
6. If the percentage of scores falling between the mean and a z score of 0.40 is 15.54, then what is the percentage of scores falling between the mean and a z score of –0.40? 
7. When attempting to find a percentage associated with a z score, the second step involves looking up: 
8. What is the difference between the denominator of the equation for the z score and that of the z statistic? 
9. The mean for the population is 67 with a standard deviation of 8.78. Given a z score of 2.56, what is the raw score? 
10. The symbol for the null hypothesis is ________, and the symbol for the research hypothesis is ________. 
11. Jenna scored 40 on a standardized test of reading ability where the mean score is 50 and the standard deviation is 10. Based on this information, what is Jenna's z score? 
12. In a standard normal curve, approximately ________% of scores fall within +/-2 standard deviations from the mean 
13. The phrase statistically significant means that: 
14. The mean for the population is 224 with a standard deviation of 35. Given a z score of 0.65, what is the raw score? 
15. The statement “It is hypothesized that children who attend an enrichment program will score higher on IQ tests compared to children who do not attend an enrichment program” best 
16. A single observation can be expressed in a number of ways that all refer to that same observation and the exact same place within the normal curve. These expressions are: 
17. ________ are the requirements that the population from which we are sampling has specific characteristics that will allow us to make accurate inferences 
18. In our course text, when the sample of heights went from 5 students to 30 and then to 140 students, what happened to the visual display of the data? 
19. Study Description: Dance Dance Revolution 
20. A researcher conducts a two-tailed hypothesis test with an alpha of 0.05 and obtains a z statistic of -0.99. What decision should he make? 
21. We reject the null hypothesis only when: 
22. The foundation of inferential statistics is the idea that: 
23. What proportion of a normal distribution corresponds to z scores greater than 1.04? 
24. The symbol for the population standard deviation is: 
25. A hypothesis test is said to be ________ when it produces fairly accurate results, even when some of the assumptions underlying the hypothesis test are violated. 
26. The formula for calculating the raw score from a z score is: 
27. A distribution of means is likely to have ________ compared to a distribution of raw scores. 
28. Because of the principle of ________, when sample sizes are at least 30, the distribution will most likely resemble a normal distribution 
29. Mehl (2007) published a study in the journal Science reporting the results of an extensive study of 396 men and women comparing the number of words uttered per day by each sex. If he was testing the idea that women talk more than men do, what type of hypothesis test would Mehl conduct? 
30. A score of 59% received for a student in a class of 124 students should be compared to a distribution of: 
31. The ________ forms a symmetrical and mathematically defined bell-shaped pattern. 
32. The distribution of means has the same mean as the distribution of scores for the 
33. What is the percentage of observations that fall between z scores of –1.2 and 0.50? 
34. A ________ is a distribution of z scores. 
35. If the assumptions of parametric testing are not met, researchers must:
36. The mean of the following four scores 1, 1, 1, and 5 is 
37. If a psychologist observed that four 5-year-old children initiated 2, 4, 6, and 12 incidents of aggression during a play period, the mean number of aggressive incidents for this group of four children was 
38. If an organizational psychologist conducts extensive interviews with 40 workers at a large factory to examine the morale among workers in general at that factory, the population is 
39. If five people obtained scores of 0, 1, 2, 4, and 8 on a test of social conformity, their mean score on the test was 
40. On a certain floor of a college dormitory that houses 40 students, there are 10 history majors, 8 English majors, 12 biology majors, and 10 psychology majors. What are the chances that a student selected at random will be a history major?