1. (6 points) The normal stress on a type of metal test specimen in known to follow a normal distribution. 12 specimens were tested and recorded as in kPa: 26.8, 25.4, 25.4, 23.6, 26.7, 23.9, 24.7, 25.8, 24.7, 24.8, 23.8, 24.2, respectively A. Compute the mean normal stress of the 12 samples. Make a point estimate for the specimen normal stress B. Find the sample median and range: C. Compute the standard deviation. Make a point estimate for the specimen normal stress standard deviation D. Find a 95% confidence interval for the mean normal stress of the specimen E. In a right-tailed hypothesis test the null hypothesis Ho claims average normal stress of the specimen is 25.0kPa. Would the samples considered in the problem lead to a rejection of Ho at the 0.05 significance level