The average daily cost of living in dollars (x) and the average wage in dollars (y) in 12 regions of a country are shown in the following table. x 82 85 85 80 90 106 64 90 69 90 75 111 y 133 149 132 158 159 199 137 159 150 159 158 175 Assume that the averages are jointly normally distributed. Use the z-values rounded to two decimal places to obtain the answers. (a) Find a regression line relating the wage to the cost of living. Round your answer to one decimal place (e.g. 98.7). Po = Round your answer to two decimal places (e.g. 98.76). B = i (b) Test for the significance of regression using a = 0.05. hypothesis that ß, = 0. (c) Estimate the correlation coefficient. Round your answer to three decimal places (e.g. 98.765). r = i

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