4. A random sample of stock prices per share (in dollars) is shown. Find the 93 % confidence interval for the average of all stock prices per share. Assume the variable is normally distributed. Provide an interpretation in the context of this problem. (4 pt) 26.69 13.88 28.37 12.00 75.37 7.50 47.50 43.00 H 3.81 53.81 13.62 45.12 6.94 28.25 28.00 60.50 40.25 10.87 46.12 14.75 ccessibility: Investigate Focus DA O 99+ W DELL5. The National Institute of Standards and Technology provides exact data on conductivity properties of materials. Following are conductivity measurements for 11 randomly selected pieces of a particular type of glass: 1.11; 1.07; 1.11; 1.07: 1.12: 1.08; .98; .98 1.02; .95; .95 Assuming the underlying population is normal, is there convincing evidence that the average conductivity of this type of glass is greater than one? Use a significance level of 0.05 to determine if you reject or fail to the reject the null hypothesis. Provide an interpretation in the context of this problem. (4 pt) essibility: Investigate Focus O W DELL