A statistics professor would like to build a model relating student scores on the first test to the scores on the second test. The test scores from a random sample of 21 students who have previously taken the course are given in the table. Test Scores Student    First Test Grade    Second Test Grade 1    70    51 2    74    93 3    61    71 4    48    55 5    64    47 6    62    73 7    78    57 8    85    57 9    70    73 10    95    83 11    80    68 12    86    52 13    95    80 14    88    91 15    64    51 16    91    89 17    81    51 18    75    95 19    52    67 20    63    47 21    86    70 Find the value of the test statistic for testing whether there is a linear relationship between the two test grades. Round your answer to two decimal places, if necessary.

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