Intro to Statistics Chapter 5 Random Variables

It is the characteristic or attribute of a sample or population that changes or varies for different individuals or things.

• Random Variable

• Variable

• Statistics

• Sample Space

It is a variable whose values depend on outcomes of a random phenomenon.

• Random Variable

• Discrete Variable

• Continuous Variable

• Independent Variable

Choose the correct examples of discrete variable.

• A film critic's rating of a film (0 - 4 stars)

• Time taken to commute to work

• The sum of the numbers rolled on a pair of dice

• Winning ticket number drawn from a raffle

• Amount of gasoline a car

Classify.

The numbers of cheeseburgers a fast-food restaurant serves each day

• None of these

• Abstract

• Continuous

• Discrete

Discrete or Continuous?

Let x represent the number of books in a university library.

• Discrete

• Continuous

Discrete or Continuous?

Let x represent the volume of blood drawn for a blood test.

• Discrete

• Continuous

Discrete or Continuous?

Let x represent the length of time it takes to get to work.

• Discrete

• Continuous

Discrete or Continuous?

Let x represent the number of tornadoes in the month of June in Oklahoma.

• Discrete

• Continuous

Is the following a probability distribution?

• Yes, because all of the probabilities are between 0 and 1 inclusive and the sum of all the probabilities is 1.

• No, all probabilities are not be between 0 and 1 inclusive

• No, the sum of all the probabilities is not 1.

• Yes, because the distribution is symmetric

Is the following a probability distribution?

• Yes, because all of the probabilities are between 0 and 1 inclusive and the sum of all the probabilities is 1.

• No, all probabilities are not be between 0 and 1 inclusive

• No, the sum of all the probabilities is not 1.

• Yes, because the distribution is symmetric