Questions from Business Statistics

Q: Police estimate that 80% of drivers now wear their seatbelts.

Police estimate that 80% of drivers now wear their seatbelts. They set up a safety roadblock, stopping cars to check for seatbelt use. 1. How many cars do they expect to stop before finding a driver w...

Q: Here are the annual numbers of deaths from tornadoes in the United

Here are the annual numbers of deaths from tornadoes in the United States from 1995 through 2015: 30, 25, 67, 130, 94, 41, 40, 55, 54, 35, 38, 67, 81, 126, 21, 45, 553, 70, 55, 47, 36 Find these stati...

Q: Vitamin D is essential for strong, healthy bones. Our bodies

Vitamin D is essential for strong, healthy bones. Our bodies produce vitamin D naturally when sunlight falls upon the skin, or it can be taken as a dietary supplement. Although the bone disease ricket...

Q: Scientists wish to test the mind-reading ability of a person

Scientists wish to test the mind-reading ability of a person who claims to have ESP. They use five cards with different and distinctive symbols (square, circle, triangle, line, squiggle). Someone pick...

Q: A true false test consists of 50 questions. How many does

A true false test consists of 50 questions. How many does a student have to get right to convince you that he is not merely guessing? Explain.

Q: A basketball player who ordinarily makes about 55% of his free

A basketball player who ordinarily makes about 55% of his free throw shots has made 4 in a row. Is this evidence that he has a hot hand tonight? That is, is this streak so unusual that it means the pr...

Q: The archer in Exercise 30 purchases a new bow, hoping that

The archer in Exercise 30 purchases a new bow, hoping that it will improve her success rate to more than 80% bull-eyes. She is delighted when she first tests her new bow and hits 6 consecutive bull-ey...

Q: The basketball player in Exercise 55 has new sneakers, which he

The basketball player in Exercise 55 has new sneakers, which he thinks improve his game. Over his past 40 shots, he made 32 much better than the 55% he usually shoots. Do you think his chances of maki...

Q: The archer in Exercise 56 continues shooting arrows, ending up with

The archer in Exercise 56 continues shooting arrows, ending up with 45 bull-eyes in 50 shots. Now are you convinced that the new bow is better? Explain.

Q: A website manager has noticed that during the evening hours, about

A website manager has noticed that during the evening hours, about 3 people per minute check out from their shopping cart and make an online purchase. She believes that each purchase is independent of...