1.) A researcher computes a Spearman rank-order correlation coefficient of –.26.
ID: 3180798 • Letter: 1
Question
1.) A researcher computes a Spearman rank-order correlation coefficient of –.26. The critical value needed to reject the null hypothesis is .38. The correct way to state the conclusion is:
a.) the population correlation coefficient is equal to zero.
b.) the population correlation coefficient is less than zero.
c.) the population correlation coefficient is not equal to zero.
d.) there is not sufficient reason to believe that the population correlation coefficient differs from zero.
2.) A researcher asks two judges to rank 20 patients according to their degree of psychopathology. The researcher would like the judges to be in substantial agreement. Which Spearman rank-order correlation coefficient for the judges’ ratings would the researcher most prefer?
a.) .63
b.) .50
c.) –.89
d.) 0
If two variables are highly positively correlated, which of the following must have approximately the same numerical value and the same sign?
a.) Neither
b.) both
c.) The paired z scores
d.) The paired raw scores
If we compute the correlation between scores on an intelligence test and grades in school, the correlation will be closest to zero for which of the following samples?
a.) Gifted children with IQs of at least 130
b.) Children from only the fourth through the eighth grades
c.) Children chosen randomly from the population
d.) Children with IQs between 90 and 130
It is more difficult to obtain a highly positive or a highly negative correlation between two variables when:
a.) the means of the raw scores of the two variables are very different.
b.) the means of the raw scores of the two variables are similar.
c.) the variability on both variables is extremely low.
d.) the variability on both variables is extremely high.
Explanation / Answer
1) d. there is not sufficient reason to believe that the population correlation coefficient differs from zero.
2) a. 0.63 (this is maximum value)
3. b. both
4. c.Children chosen randomly from the population
5. a. the means of the raw scores of the two variables are very different
5.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.