Questions from Statistics

Q: A newspaper used images of cigarettes of different sizes to depict the

A newspaper used images of cigarettes of different sizes to depict the percentages of adults who smoke in 2000 and in 2017. Which graphic would depict these data more objectively: a bar graph or image...

Q: A P-value of 0.00001 is obtained when sample

A P-value of 0.00001 is obtained when sample data are used to test the claim that the majority of car crashes occur within 5 miles of home. What does this P-value tell us?

Q: A survey of 61,647 people included several questions about office

A survey of 61,647 people included several questions about office relationships. Of the respondents, 26% reported that bosses scream at employees. The survey was an Elle/MSNBC.com survey to which Inte...

Q: In a test of the claim that a majority of Americans believe

In a test of the claim that a majority of Americans believe that human activity is the major cause of global warming, the null hypothesis is p = 0.5 and the alternative hypothesis is p > 0.5.

Q: In a hypothesis test involving a claim made about a population proportion

In a hypothesis test involving a claim made about a population proportion, if there is sufficient evidence to reject the null hypothesis, then there may or may not be sufficient evidence to support th...

Q: The area to the right of the standard score z = 1

The area to the right of the standard score z = 1.0 is 0.1587, so the P-value in a two-tailed test is 0.1587.

Q: The claim p > 0.5 can never be supported if

The claim p > 0.5 can never be supported if the sample proportion p̂ is less than 0.5.

Q: In a 3M Privacy Filters poll, 806 adults were asked to

In a 3M Privacy Filters poll, 806 adults were asked to identify their favorite seat when they fly, and 61% of them chose a window seat. Test the claim that the majority of adults prefer window seats w...

Q: A psychologist suspects that breathing exercises can help people with depression.

A psychologist suspects that breathing exercises can help people with depression. To decide whether he is correct, he identifies a group of subjects, watches them do the breathing exercises, and then...

Q: A survey showed that among 785 randomly selected subjects who completed four

A survey showed that among 785 randomly selected subjects who completed four years of college, 144 smoke and the others do not smoke (based on data from the American Medical Association). Test the cla...