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Let r denote the linear correlation between income (x) and ACT composite score (y). The hypotheses are given below:
Null hypothesis:
H0: r = 0
That is, the sample correlation coefficient (r) is not significantly different from zero. There is no significant positive linear relationship between income and ACT composite score.
Alternative hypothesis:
Ha: r ≠ 0
That is, the sample correlation coefficient is significantly different from zero.
There is a significant positive linear relationship between income and ACT composite score.
Degrees of freedom:
The formula for degrees of freedom is as follows:
Df = n – 2.
The number of data values given are 7, that is n = 7.
Substitute n = 7 in the degrees of freedom formula.
Df = n – 2 = 10 – 2 = 8.
The level of significance for the test is 0.05.
Sample correlation coefficient:
The value of the sample correlation coefficient (r) can be obtained using Excel formula.
Enter the values of income in columns A2:A8 in Excel.
Enter the values of ACT composite score in columns B2:B8 in Excel.
Enter the function, =CORREL(A2:A8,B2:B8).
Thus, the value of the sample correlation coefficient, r is 0.6203.
Test Statistic:
The test statistic for hypothesis test is calculated as follows:
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