Statistics Unit Review

Which of the following are true about probabilities?

• All probabilities in a sample space must add to 1.

• Each probability in a sample space must be between 0 and 1.

• To find probabilities you divide a larger number by a smaller number.

• The probability of something not happening is 1 - the probability of the event happening.

• 1 is 100%

If we observe more and more repetitions of any chance process, the proportion of times that a specific outcome occurs approaches its probability. This is the . . .

• law of large numbers.

• IQR rule.

• central limit theorem.

• law of large samples.

If two events cannot occur at the same time, they are . . .

• mutually exclusive.

• independent.

• complements.

• enemies.

The table shows the probabilities of people leaving their house at particular times for car trips. So there is a 4% chance that an American family will leave their house between 10 PM and 12:59 PM.

What probability should replace the ? in the table?

• 0.782

• 0.218

• 0.318

• 0.682

What is the word in statistics for any characteristic or attribute of a person, place, or thing?

• variable

• descriptive statistic

• inferential statistic

• parameter

The table shows the probabilities of people leaving their house at particular times for car trips. So there is a 4% chance that an American family will leave their house between 10 PM and 12:59 PM.

What is the probability that a trip did not begin between 9 AM and 12:59 PM?

• 0.234

• 0.766

• 0.548

• 0.682

What is the probability that a trip happened between 1 AM and 12:59 PM?

• 0.234

• 0.411

• 0.033

• 0.144

What is the probability that a randomly selected senior boy plays football OR wrestles?

• 9/143

• 21/143

• 30/143

• 39/143

What is the probability that a randomly selected senior boy plays football but does not wrestle?

• 9/143

• 12/143

• 18/143

• 104/143

What is the probability that a randomly selected senior boy plays football AND wrestles?

• 9/143

• 12/143

• 18/143

• 39/143