Question: For a random sample of 12 households, the sample correlation coefficient, r between disposable income (x) and consumer expenditure (y) is found to be 0.9025.

For a random sample of 12 households, the sample correlation coefficient, r between disposable income (x) and consumer expenditure (y) is found to be 0.9025. You are asked to carry out a relevant hypothesis test to establish whether there is any evidence to suggest that the population correlation coefficient is positive.

Given the information above, the value of the test statistic is ______

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