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A sample of 10 observations from a normal distribution has a sample mean of 50 and a sample standard deviation of 15.43. The alternative hypothesis is that mu is greater than 45. What is the critical value of the test statistic at the 0.02 level of significance

a. 1.973

b. 2.150

c. 2.398

d. 1.833.

e. 2.821

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