Use the Rank Correlation Coefficient to Test for a Correlation

question 98

Essay

Use the rank correlation coefficient to test for a correlation between the two variables. A
placement test is required for students desiring to take a finite mathematics course at a
university. The instructor of the course studies the relationship between students' placement
test score and final course score. A random sample of eight students yields the following data. $\begin{array}{cc}\underline {\text { Placement Score } } & \underline { \text { Final Course Score }} \\38 & 63 \\90 & 41 \\95 & 54 \\51 & 32 \\86 & 93 \\74 & 60 \\60 & 61 \\57 & 89\end{array}$ Compute the rank correlation coefficient, rs, of the data and test the claim of correlation
between placement score and final course score. Use a significance level of 0.05.

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Definitions:

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Confidence Level

The probability that a confidence interval will capture the true population parameter, expressed as a percentage, indicating the reliability of the estimate.

Population Mean

The average value of all the items in a population.

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