## COSC 622 Quiz Statistical Concepts

COSC 622 Quiz: Statistical Concepts

1. A group of researchers is attempting to design an instrument that will measure self-esteem. The researchers have an extensive list of traits that may contribute to this construct. Which analysis may assist the research team in narrowing the list of traits into a few dimensions?
2. A student conducting a research study was told by her professor to use a scatterplot in conjunction with calculating the correlation coefficient. She discovered that the data points clustered along a straight line; this means that:
3. A researcher is looking for a specific study report, in which he/she knows the kurtosis value. He reads the following kurtosis values in various reports. Which one supports a mesokurtic distribution?
4. A researcher determines that there is a positive correlation between sleep and test scores; this means that as the amount of sleep is increased, then test scores will:
5. If the researcher knows that the mean is 60 and the standard deviation is 6, then the majority of the scores falling between +1 or -1 standard deviation of the mean fall between:
6. In studying the correlation between the number of hours studied and scores on the comprehensive exam, the researcher found a correlation of .30. According to Cohen’s guidelines, what would this mean regarding the strength of the relationship?
7. The teacher grades the papers and determines the following set of scores: 90, 85, 87, 85, 92, 90, 83, 85, and 98. What is the mode?
8. When looking at a list of students’ test scores, the teacher notices that one test score is significantly lower than the majority of the scores. This is known as a/an:
9. In comparing Spearman’s Rho to a Phi Coefficient, one would generally prefer to use Spearman’s Rho when correlating:
10. The teacher has a small class with only 7 students. The teacher grades their homework and reports scores of: 10, 7, 8, 12, 9, 11, and 13. What is the median?
11. One reason for choosing either norm-referenced or criterion-referenced interpretation involves:
12. A T score has a fixed mean of __________ and a fixed standard deviation of __________.
13. The group scores to which each individual is compared are referred to as:
14. Aptitude, intelligence, and achievement tests are all examples of:
15. Percentile scores:
16. Z scores, T scores, and deviation IQs are examples of:
17. Grade equivalents are useful because they:
18. A type of standard score with a mean of 100 and a standard deviation of 15 is:
19. A raw score can be transformed into any type of standard score by first:
20. Denise took an aptitude test that was first taken by a large group of male engineers, on whom the test was standardized. Denise is a nurse. What might be a concern when interpreting her test scores?
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