Question

In: Statistics and Probability

Assume that you observe (0,1),(1,2),(3,1),(4,3) from a simple linear model. a). Construct a 95% confidence interval...

Assume that you observe (0,1),(1,2),(3,1),(4,3) from a simple linear model.

a). Construct a 95% confidence interval for β1 and determine its margin error.

b). Test H0 : β0 = 2 versus H1 : β0 < 2 at α = 0.01 level of significance.

c). Find the power of the test from part b) at β0 = 1.

Solutions

Expert Solution

a). Construct a 95% confidence interval for β1 and determine its margin error.

The 95% confidence interval for β1 is between -1.0086 and 1.6086.

The margin error is 0.3041.

b). Test H0 : β0 = 2 versus H1 : β0 < 2 at α = 0.01 level of significance.

t = 2/0.775403 = 2.58

p-value = 0.0616

Since the p-value (0.0616) is greater than the significance level (0.01), we fail to reject the null hypothesis.

Therefore, we can conclude that β0 = 2.

c). Find the power of the test from part b) at β0 = 1.

Power = 0.1287

0.327
r   0.572
Std. Error   0.962
n   4
k   1
Dep. Var. y
ANOVA table
Source SS   df   MS F p-value
Regression 0.9000 1   0.9000 0.97 .4279
Residual 1.8500 2   0.9250
Total 2.7500 3  
Regression output confidence interval
variables coefficients std. error    t (df=2) p-value 95% lower 95% upper
Intercept 1.1500 0.775403
x 0.3000 0.3041 0.986 .4279 -1.0086 1.6086

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