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Let x be a random variable representing dividend yield of Australian bank stocks. We may assume that x has a normal distribution with Alpha = 2.8%. A random sample of 16 Australian bank stocks has a sample mean dividend yield of 8.91%. For the entire Australian stock market, the mean dividend yield is mu = 6.4%. If you wanted to test, at a .05 level of significance,to determine if these data indicate that the dividend yield of all Australian bank stocks is higher than 6.4% what is the critical value that you would use? Place your answer, rounded to2 decimal places, in the blank. For example, 2.34 would be a legitimate entry.