Two nominal variables are to _____ coefficient as two ordinal variables are to _____ coefficient.
a. Pearson product-moment correlation; Spearman rank-order correlation
b. Spearman rank-order correlation; Pearson product-moment correlation
c. Phi; Spearman rank-order correlation
d. Point-biserial correlation; Spearman rank-order correlation
If both variables are measured on a nominal scale, what type of correlation coefficient is appropriate?
a. Spearman's rank-order correlation coefficient
b. phi coefficient
c. point-biserial correlation coefficient
d. none, because correlations cannot be computed on nominal data
Suppose that the correlation between height and weight for adults is +.75 . What proportion (or percent) of the variability in weight is accounted for by the relationship with height?
a. 75
b. 25
c. 56
d. unable to determine
The _____ is a measure of the proportion of variance in one of the variables that is accounted for by the other variable.
a. Spearman rank-order correlation coefficient
b. coefficient of determination
c. point-biserial correlation coefficient
d. Pearson product-moment correlation coefficient
In a psychology class of 100 students, test scores are normally distributed with a mean of 80 and a standard deviation of 5 . Approximately what percentage of students have scores between 70 and 90?
a. 68
b. 80
c. 95
d. 99
Karen's first psychology exam score is 1 standard deviation from the mean in a normal distribution. The test has a mean of 75 and a standard deviation of 5 . Karen's percentile rank would be:
a. 16.
b. 54.
c. 70.
d. cannot say from the information given
Approximately what percentage of scores are between z=1 and z=2?
a. 50
b. 68
c. 16
d. 13.5
Rich's first psychology exam score is +1 standard deviation from the mean in a normal distribution. The test has a mean of 60 and a standard deviation of 6 . Rich's percentile rank would be approximately:
a. 70.
b. 84.
c. 66.
d. Cannot say from the information given.
If the average height for women is normally distributed with a mean of 65 inches and a standard deviation of 2.5 inches, then approximately 95 of all women should be between _____ and _____ inches in height.
a. 62.5; 67.7
b. 60; 70
c. 57.5; 72.5
d. Cannot say from the information given.
Faculty in the psychology department at State University consume an average of 5 cups of coffee per day with a standard deviation of 1.5 . The distribution is normal. How many cups of coffee would an individual at the 25th percentile drink per day?
a. 4
b. 5
c. 6
d. 7
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