To evaluate the quality of their product, a manufacturer of cell phones checks every 50th phone off the assembly line. Out of 200 phones tested, 4 are defective. The manager concludes that about 2% of the cell phones produced will be defective.
To determine whether the students will attend an arts festival at the school, Oliver surveys his friends in the art club. All of Oliver's friends plan to attend. So, Oliver assumes that all the students at his school will also attend.
A random sample of people at a mall shows that 22 prefer to take a family trip by car, 18 prefer to travel by plane, and 4 prefer to travel by bus. Is the sample method valid? If so, how many people out of 500 would you expect to say they prefer to travel by plane?
Dear guest, you are not a registered member. As a guest, you only have read-only access to our books, tests and other practice materials.
(request help)
(show solution)
