## Buy Guided Liberty University PSYC 355 Correlation

- If the following seven scores are ranked from smallest (#1) to largest, what rank should be assigned to a score of X = 6? Scores: 1, 1, 3, 6, 6, 6, 9
- What correlation is obtained when the Pearson correlation is computed for data that have been converted to ranks?
- A researcher measures IQ and weight for a group of college students. What kind of correlation is likely to be obtained for these two variables?
- A set of n = 5 pairs of X and Y values has SSX = 16, SS Y = 4 and SP = 2. For these data, what is the Pearson correlation?
- A researcher obtains a Pearson correlation of r = 0.60 for a sample of n = 6 pairs of X and Y scores. If the researcher tests the significance of the correlation, what value will be obtained for the t statistic?
- For a group of graduating college seniors, a researcher records each student’s rank in his/her high school graduating class and the student’s rank in the college graduating class. Which correlation should be used to measure the relationship between these two variables?
- Three main characteristics of a correlation coefficient include all of the following except:
- A researcher records the age and price for a group of used Hondas. What kind of correlation is likely to be obtained for these two variables?
- What is indicated by a positive value for a correlation?
- Suppose that there is a correlation of r = 0.41 between the amount of time that each student reports studying for an exam and the student’s grade on the exam. This correlation would mean that there is a tendency for people who study more to get better grades.
- The value obtained for the sum of products, SP, determines the sign (+/–) for the Pearson correlation.
- A researcher obtains SSX = 20, SSY = 5, and SP = 7 for a set of n = 25 pairs of scores. The Pearson correlation for these scores is r = 7/10 = 0.70.
- If people are classified by age (over 30/under 30) and by political affiliation (Democrat/Republican), then the point-biserial correlation would be the proper technique to measure the relationship between the two variables.
- The sign of the correlation (+/–) is generally meaningless for the point-biserial correlation and the phi-coefficient.
- For a two-tailed hypothesis test evaluating the significance of a correlation, the null hypothesis states that the sample correlation is zero.
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