A researcher measures the correlation of the time it take participants to complete two tasks purported to measure the same cognitive skill.Participant times are converted to ranks from fastest to slowest.If = 165 and n = 20,then what is the decision for this correlation test?
A) retain the null hypothesis
B) reject the null hypothesis
C) there is not enough information to answer this question

Question

Quizplus · Accepted Answer

Since n=20, we can use a significance level of 0.05 and find the critical value for a two-tailed test with 18 degrees of freedom to be ±2.101. Since the correlation coefficient |r| = 0.165 is less than the critical value, we reject the null hypothesis that there is no significant correlation between the two tasks.

A Researcher Measures the Correlation of the Time It Take