Questions from Statistics Principles

Q: Refer to the “Sleeping” results from Problem 22. What

Refer to the “Sleeping” results from Problem 22. What could be done to decrease the width of the confidence interval?

Q: A random sample of 51 fatal crashes in 2017 in which the

A random sample of 51 fatal crashes in 2017 in which the driver had a positive blood alcohol concentration (BAC) from the National Highway Traffic Safety Administration results in a mean BAC of 0.167...

Q: How much time do Americans spend eating or drinking? Suppose for

How much time do Americans spend eating or drinking? Suppose for a random sample of 1001 Americans age 15 or older, the mean amount of time spent eating or drinking per day is 1.22 hours with a st...

Q: A Tootsie Pop is a sucker with a candy center. A

A Tootsie Pop is a sucker with a candy center. A famous commercial for Tootsie Pops once asked, “How many licks to the center of a Tootsie Pop?” In an attempt to answer this question, Cory Heid of Sie...

Q: A recent Gallup poll asked 1006 Americans, “During the past

A recent Gallup poll asked 1006 Americans, “During the past year, about how many books, either hardcover or paperback, did you read either all or part of the way through?” Results of the survey indica...

Q: The following data represent the pH of rain for a random sample

The following data represent the pH of rain for a random sample of 12 rain dates in Tucker County, West Virginia. A normal probability plot suggests the data could come from a population that is norma...

Q: Travelers pay taxes for flying, car rentals, and hotels.

Travelers pay taxes for flying, car rentals, and hotels. The following data represent the total travel tax for a 3-day business trip in 8 randomly selected cities. Note: Chicago travel taxes are the h...

Q: A marketing executive for Coca-Cola, Inc., wants to

A marketing executive for Coca-Cola, Inc., wants to identify television shows that people in the Boston area who typically drink Coke are watching. The executive has a list of all households in the Bo...

Q: The following data represent the repair cost for a low-impact

The following data represent the repair cost for a low-impact collision in a simple random sample of mini- and micro-vehicles (such as the Chevrolet Aveo or Mini Cooper). (a) Use either Option 1 or Op...

Q: The following data represent the age (in weeks) at which

The following data represent the age (in weeks) at which babies first crawl based on a survey of 12 mothers conducted by Essential Baby. (a) Use either Option 1 or Option 2 to verify the requirements...