Questions from Statistics

Q: Once you have constructed the 95% confidence interval around your sample

Once you have constructed the 95% confidence interval around your sample mean, how do you interpret its possible relationship to the population mean?

Q: A consumer researcher surveyed customers at a Macy’s store to obtain sample

A consumer researcher surveyed customers at a Macy’s store to obtain sample data consisting of the amount of credit card debt that each customer has.

Q: Suppose you seek a particular margin of error for your study.

Suppose you seek a particular margin of error for your study. How can you determine an appropriate sample size?

Q: Our exit polls found that candidate Jones received 56% of the

Our exit polls found that candidate Jones received 56% of the vote with a margin of error (for 95% confidence) of 5 percentage points, but the final results showed Jones with only 47% of the vote.

Q: The Kingston Chronicle publishes an article stating that, based on survey

The Kingston Chronicle publishes an article stating that, based on survey results, 82% of Orange County residents oppose an increase in the sales tax, with a margin of error of 4 percentage points. We...

Q: A reporter for the Kingston Chronicle claims that any good confidence interval

A reporter for the Kingston Chronicle claims that any good confidence interval should be based on a sample that is at least 5% of the population size.

Q: The Journal of the American Medical Association published an article about a

The Journal of the American Medical Association published an article about a survey of adults and cited this 95% confidence interval for the proportion of adults who use at least one prescription medi...

Q: The following table gives the number of daily newspapers and their total

The following table gives the number of daily newspapers and their total circulation (in millions) for selected years since 1920 (from Editor& Publisher).

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

In a study of 1228 randomly selected medical malpractice lawsuits, it is found that the proportion that were dropped or dismissed is 0.697. When a 95% confidence interval is constructed for the popula...

Q: Here is a typical statement made by the media: “Based

Here is a typical statement made by the media: “Based on a survey of 1068 likely voters, 56% favor the proposed environmental legislation, and this survey has a margin of error of 3 percentage points....