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For a sampte of 5D ri'icintt'iiljllr observations the regrESsion of the percentage return on an investrnent [y] against the percentage change in the consumer price index [at] was estimated. The sample regression line, obtained through least squares, is shown below. The estimated standard deviation of the slope of the population regression line was 2.8.Test the null hypothesis that the slope of the poputation regression line is El against the altemative that the slope is positive. Use =.1. Find the test Statistic Find p 1value