(b) (3 points) Construct a 99%% 2-sided Confidence Interval for the population standard devi- ation of all of these scores, a. 6. Continuing from previous question: Mike is suspicious that the company's claim is false. He manages to convince the company to allow him to test a larger sample of 128 computers at their warehouse for free. He found that only 40 of them scored 20000 or higher. (a) (3 points) Construct an 80% Confidence Interval Upper Bound for the overall proportion of performance test scores that are at least 20000. (b) (3 points) Construct an 80% 2-sided Confidence Interval for the overall proportion of per- formance test scores that are at least 20000