4.[10%] Laboratory tosts are performed to evaluate how confining pressure (x) affects the shear resistance (y) of a material. Estimate the linear regression line () by using the least square method.

3.[10%] Laboratory tests are performed to evaluate the compressive strengths for 2 types of concrete (A and (B). 10 specimens are used for each type of concrete. The sample standard deviati tions are 200 kPa and 250 kPa for concrete A and concrete B, respectively. Construct a 90% confidence interval for the ratio of the 2 population variances

4.[10%] Laboratory tosts are performed to evaluate how confining pressure (x) affects the shear resistance (y) of a material. Estimate the linear regression line () by using the least square method.

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