Questions from Business Statistics

Q: Consider again the task of the quality control inspectors in Exercise 30

Consider again the task of the quality control inspectors in Exercise 30 . 1. In this context, what is meant by the power of the test the inspectors conduct? 2. They are currently testing 5 items each...

Q: A company is sued for job discrimination because only 19% of

A company is sued for job discrimination because only 19% of the newly hired candidates were minorities when 27% of all applicants were minorities. Is this strong evidence that the company hiring prac...

Q: Highway safety engineers test new road signs, hoping that increased reflectivity

Highway safety engineers test new road signs, hoping that increased reflectivity will make them more visible to drivers. Volunteers drive through a test course with several of the new- and old-style s...

Q: A statistics professor has observed that for several years students score an

A statistics professor has observed that for several years students score an average of 105 points out of 150 on the semester exam. A salesman suggests that he try a statistics software package that g...

Q: A company is willing to renew its advertising contract with a local

A company is willing to renew its advertising contract with a local radio station only if the station can prove that more than 20% of the residents of the city have heard the ad and recognize the comp...

Q: Software, part II 203 students signed up for the Stats course

Software, part II 203 students signed up for the Stats course in Exercise 35 . They used the software suggested by the salesman, and scored an average of 108 points on the final with a standard deviat...

Q: The company in Exercise 36 contacts 600 people selected at random,

The company in Exercise 36 contacts 600 people selected at random, and only 133 remember the ad. 1. Should the company renew the contract? Support your recommendation with an appropriate test. 2. Expl...

Q: The manufacturer of a metal stand for home TV sets must be

The manufacturer of a metal stand for home TV sets must be sure that its product will not fail under the weight of the TV. Since some larger sets weigh nearly 300 pounds, the company safety inspectors...

Q: The stem-and-leaf display shows populations of the 50

The stem-and-leaf display shows populations of the 50 states, in millions of people, according to the 2010 census. 1. From the stem-and-leaf display, find the median and the interquartile range. 2. Wr...

Q: During an angiogram, heart problems can be examined via a small

During an angiogram, heart problems can be examined via a small tube (a catheter) threaded into the heart from a vein in the patient leg. It important that the company that manufactures the catheter m...