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A person's muscle mass is expected to decrease with age. To explore this relationship in women, a nutritionist randomly selected 60 women aging from age 40 to 79 and measured their muscle mass. Using age as the explanatory variable and the muscle mass as the dependent variable, computer output of the data is as follows (the p-values are intentionally left blank): Predictor | Coef | | StDev | 'T [P Constant | 113.052 || 9.170 || 12.329 | | age (0-8 [0as7 [3104 | Part a: What is the regression equation? Part b: Calculate the 99% confidence interval of the slope of the regression line. Part c: Use the information provided to test whether there is a significant relationship between a person's age and muscle mass at the 5% level