A filling machine at a local soft drinks company is calibrated to fill the cans at a mean amount of 12 fluid ounces and a standard deviation of 0.5 ounces. The company wants to test whether the standard deviation of the amount filled by the machine is 0.5 ounces. A random sample of 15 cans filled by the machine reveals a standard deviation of 0.67 ounces. What type of test should be performed? C) l) None of the above C) 2) Lower-tail test C) 3) Upper-tail test @ 4) Two-tail test Question 14 (1 point) A corporation randomly selects 50 salespeople and finds that 60% who have never taken a self-improvement course would like such a course. The firm did a similar study 10 years ago in which 50% of a random sample of 60 salespeople wanted a self-improvement course. The groups are assumed to be independent random samples. Let and represent the true proportion of workers who would like to attend a self-improvement course in the recent study and the past study, respectively. If the firm wanted to test whether this proportion has decreased from the previous study, which represents the relevant hypotheses? : - = O versus HI: : - O versus HI: - Tt2 0 : - S O versus HI: - 0 versus HI: