Please explain both parts. 6

ALBERTA eClass Famed California architect Julia Morgan pioneered the use of reinforced concrete to help design buildings that can withstand of 2 disasters such as the 1906 San Francisco earthquake. A civil engineer intern at the company, Building Buildings, is tasked with comparing the stresses (measured in MPa) of buildings on 25 random streets in San Francisco, taking a sample of concrete from one building made with plain concrete and one building (similar in design) made with reinforced concrete. She also determined that all necessary assumptions are satisfied. The summary statistics are provided in the tables below. Summaries for each of the columns are as follows: (Note: std. dev. = standard deviation) Reinforced Plain Difference AVERAGE 29.711 28.902 0.809 STD. DEV. 3.492 1.521 1.883 a. If the absolute value of the test statistic to see if reinforced concrete has a higher mean stress than plain concrete is 2.148, what are the respective degrees of freedom and p-value range? Fi O 24 and (0.975, 0.99) Ti 48 and (0.02, 0.05) 48 and (0.01, 0.025) O 24 and (0.02, 0.05) 24 and (0.01, 0.025) b. Refer to the previous question. What is the BEST CORRESPONDING 95% confidence interval for the test above? (-00, 1.429) (0.189, 00) O (-00, 1.453) (0.032, 1.586) (0. 165, 00 )