Random Variables

• A
• B
• C
• D

The mean hourly salary for a high school graduate is $13.50 per hour with a standard deviation of $5.75. The mean hourly salary for a person with an Associate's degree is $19.75 with a standard deviation of $9.25. What is the expected difference in the hourly salaries between a high school graduate and a person who earned an Associate's degree? Let D = HS - Assoc

• $33.25

• $-3.50

• $-6.25

• $15.00

The mean hourly salary for a high school graduate is $13.50 per hour with a standard deviation of $5.75. The mean hourly salary for a person with an Associate's degree is $19.75 with a standard deviation of $9.25. What is the standard deviation of the difference in the hourly salaries between a high school graduate and a person who earned an Associate's degree? Let D = HS - Assoc

• $10.89

• $7.25

• $-3.50

• $15.00

The mean of the sum or difference of two random variables is __________________.

• the sum or difference of their respective means

• found by adding or subtracting the original means and then dividing by two

It is a variable whose values are determined by chance.

• Random Variable

• Discrete Variable

• Continuous Variable

• Independent Variable

What is the numerical quantity assigned to the outcome of an experiment usually denoted by an uppercase letter such as X?

• Frequency

• Probability

• Random variable

• Sample

Is this a probability distribution?

• No, the sum of p(x) does not equal 1.

• Yes, all p(x) are between 0 and 1.

• No, all p(x) are not between 0 and 1.

• Yes, the sum p(x) is 1.

Which of the following refers to a rule that assigns a numerical value or characteristic to an outcome of an experiment?

• Expected Value

• Random Variable

• Range Space

• Probability Distribution

Which of the following is not a random variable?

• The heights of randomly-selected buildings in New York City.

• The suit of a card randomly-selected from a 52-card deck.

• The number of children in randomly-selected households in the United States.

• The amount of money won (or lost) by the next person to walk out of a casino in Las Vegas.

An instance of a random variable is...

• an entry in a hypothetical list of possible outcomes.

• any phenomenon in which all outcomes are equally likely.

• a number that changes in a predictable way in the long run.

• a number that is associated with a set of outcomes