Testing: Ho: µ < 27.5 H1:µ > 27.5 Your sample consists of 43 values, with a sample mean of 28.4. Suppose the population standard deviation is known to be 2.46. a) Calculate the value of the test statistic, rounded to 2 decimal places. = Z b) At a = 0.08, the rejection region is %3D Oz < -1.41 Oz < -1.41 or z > 1.41 Oz < -1.75 Oz > 1.41 Oz < -1.75 or z > 1.75 Oz > 1.75 c) The decision is to Fail to reject the null hypothesis O Accept the alternative hypotheis Reject the null hypothesis O Accept the null hypothesis

Testing:H0:μ=38.5H1:μ<38.5Your sample consists of 35 subjects, with a mean of 38.3 and a standard deviation of 1.93.Calculate the test statistic, rounded to 2 decimal places. t =

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At a certain high school, every freshman has his or her height The freshman boys have a mean height of 65.2 inches and a standard deviation of 3.2 inches. The freshman girls have a mean height of 63.5 inches and a standard deviation of 2.7 inches. The proportion of of freshman girls has heights between 60 to 65 inches is 0.6133. What is the interpretation of this normal density area? (i) The proportion of freshman having heights between 60 to 65 inches is 0.6133 (ii) The probability that a randomly selected freshman girl have heights between 60 to 65 inches is 0.6133 or 61.33% Oboth (i) and (ii) are correct We can not interpret the given area..