Statistics and Probability

A zoologist wants to study the effects of captivity on Killer Whales by comparing those in captivity with those in the wild. This is an example of

• a survey

• an experiment

• an observational study

• a shopping spree

Mr. Magoo wants to find out what people prefer on their ice cream before he opens up his Ice Cream Emporium. His best option would be a(n)

• survey

• observational study

• experiment

• flu shot

How would caffeine affect the behavior of chihuahua puppies? Well, to find out, our best bet would be

• a survey

• an observational study

• an experiment

• a pizza party

Octavius wants to know the favorite sport of people at his school so he asks his baseball team. This method would be

• biased

• unbiased

A hospital wants to open a gym. They ask the night-shift ER staff when they would use the gym. This method would be

• biased

• unbiased

Biased questions lead people to answer a particular way.

• A. True
• B. False

Fewer accidents occur at intersections with stoplights than at intersections that do not have stoplights.  Would you be in favor of a stoplight at the intersection of Milo Fisher and Highway 92?

• Unbiased

• Biased

Give the 5-point summary for the following data:

14, 24, 8, 26, 19, 38, 12, 15, 12, 18, 9, 24, 12, 21, 9, 15, 13, 28

• 8, 11.5, 17, 28, 38

• 8, 10, 14, 24, 38

• 8, 12, 15, 24, 38

• 8, 12.5, 16, 23, 38

Give the mean and standard deviation for the following data:

14, 24, 8, 26, 19, 38, 12, 15, 12, 18, 9, 24, 12, 21, 9, 15, 13, 28

• 17.6, 7.7

• 15.4, 9.3

• 16.3, 8.1

• 18.4, 6.8

In a board game, players take turns spinning a wheel with 4 spaces and values of $100, $300, $400, $800. The probability of landing on $100 is 4/9. The probability of landing on $300 is 2/9. The probability of landing on $400 is 2/9. The probability of landing on $800 is 1/9. What is the expected value of spinning the wheel?

• $299.33

• $301.17

• $263.98

• $288.89