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A trading desk manager at a financial institution oversees currency swap lines and has gathered weekly return data over a year for a portfolio of currency swaps. The mean weekly return calculated from this data is 0.71%, with a sample standard deviation of 0.52%. To determine if the mean weekly return is significantly greater than zero, a hypothesis test is conducted at a 5% significance level. With the test statistic calculated as 2.84, which of the following conclusions is correct?