Refer to the following ANOVA table

Source	DF	SS	MS	F
Regression	2	78.764	39.382	4.182
Residual Error	62	583.797	9.416
Total	64	662.561

a) How large was the sample?

Sample size ---------

b) How many independent variables are there?

c) How many dependent variables are there?

d-1) Compute the standard error of estimate?( Round final answer to 3 decimal places)

d-2) About 95% of the residuals be between what two values? ( Round the final answers to 3 decimal places and negative answer indicate by minus sign)

e-1) Determine the coefficient of multiple determination. ( Final answer to 3 decimal places)

e-2) Determine the percentage variation for the independent variables. ( Final answer to 1 decimal place)

2. In a multiple regression equation two independent variables are considered, and the sample size is 28. The regression coefficients and the standard errors are the following:

b₂ = 2.595

b₂ = -0.790

s_b1 = 0.39

s_b2 = 0.56

Conduct a test of hypothesis to determine whether independent variables has a coefficient equal to zero. Would you consider deleting either variables from the regression equation? Use the 0.05 significance level? ( Round final answer to 3 decimal places)

H₀ : ₁ = 0 H₀ : ₂ = 0

H₁ : ₁= 0 H₁ : ₂= 0

H₀ is rejected if t < -2.060 or t > 2.060

t₁ = ----- t₂ = ---------