Questions from Statistics

Q: A study commissioned by the U.S. Department of Education

A study commissioned by the U.S. Department of Education, based on responses from 1015 randomly selected teenagers, concluded that 44% of teenagers cite grades as their greatest source of pressure. Te...

Q: Listed below are the lengths (in minutes) of animated children’s

Listed below are the lengths (in minutes) of animated children’s movies. Construct a stem plot. Does the stem plot show the distribution of the data? If so, how? 83 88 120 64 69 71 76 74 75 76 75 75 7...

Q: To show how sugar production doubled from 1990 to now, an

To show how sugar production doubled from 1990 to now, an illustrator draws two sugar cubes. The first cube is drawn with a length of 1 cm on each side, and the second cube is drawn with a length of 2...

Q: Based on information from the National Cyber Security Alliance, 93%

Based on information from the National Cyber Security Alliance, 93% of computer owners believe that they have antivirus programs installed on their computers. In a random sample of 400 scanned compute...

Q: A Department of Health and Human Services study of illegal drug use

A Department of Health and Human Services study of illegal drug use among 12- to 17-year-olds reported a decrease in use (from 11.4% in 1997) to a current level of 9.9%. Suppose a survey in a large hi...

Q: In a KRC Research poll, 1002 adults were asked if they

In a KRC Research poll, 1002 adults were asked if they felt vulnerable to identity theft, and 53% of them said “yes.” Test the claim that the majority of adults feel vulnerable to identity theft.

Q: In a study of 1228 randomly selected medical malpractice lawsuits, it

In a study of 1228 randomly selected medical malpractice lawsuits, it was found that 856 of them were dropped or dismissed (based on data from the Physicians Insurers Association of America). Test the...

Q: When 3011 adults were surveyed in a Pew Research Center poll,

When 3011 adults were surveyed in a Pew Research Center poll, 2198 said that they use the Internet. Is it accurate for a newspaper reporter to write that “3/4 of all adults use the Internet”? Why or...

Q: According to the Energy Information Administration, 53.0% of

According to the Energy Information Administration, 53.0% of U.S. households used natural gas for heating in 1997. A recent survey of 3600 randomly selected U.S. households showed that 54.0% used natu...

Q: In clinical tests of the drug Lipitor, 863 patients were treated

In clinical tests of the drug Lipitor, 863 patients were treated with the drug and 19 of them experienced flu symptoms (based on data from Parke-Davis). Test the claim that the percentage of treated p...