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b. Test the regression coefficient B_1 of age is larger than 0.2 using 5% significance level. c. Find a 95% confidence interval for the regression

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b. Test the regression coefficient B_1 of age is larger than 0.2 using 5% significance level. c. Find a 95% confidence interval for the regression coefficient of age. d. The sample mean and sample standard deviation for age are 37.87 and 10.39, respectively. Find a 95% confidence interval for the mean absent days of 30 years old employees

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