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Consider the following hypotheses: Ho: U = 45 HA: H # 45 A sample of 16 observations yields a sample mean of 41. Assume that the sample is drawn from a normal population with a sample standard deviation of 7.5. a. Calculate the value of the test statistic. Note: Negative value should be Indicated by a minus sign. Round final answer to 3 decimal places. Test statistic b. At the 5% significance level, does the population mean differ from 45? O We can conclude that the population mean differs from 45. O We cannot conclude that the population mean differs from 45. O We cannot conclude that the population mean does not differs from 45. We can conclude that the population mean does not differs from 45