AP Stats 6.1 and 6.2 Review

Can individual discrete random variables have a value over 1?

• Yes

• No

What does a discrete variable define?

• Probability of individual outcomes

• Probability of all outcomes

• Number of possible outcomes

• What the outcomes are

What is the expected value?

• Number of possible outcomes

• Average of all possible outcomes

• Weighted average of the possible outcomes

• Distribution of all possible outcomes

True or False: A continuous random variable can be any value between two numbers (for example: all numbers between 0 and 1).

• True

• False

Consider a rare 8 sided die where each face is numbered 1 through 8, where the even numbers have a 0.15 percent chance of being landed on and the odd numbers only have a 0.1 percent chance. Find the expected value of the die.

• 4.6

• 4.7

• 3.5

• 6

Given that E(x) = 4.2, find the value of a

• 1

• 0.01

• 0.1

• 0.001

Find the value of k

• .0583

• .0853

• .04

• .01

True or False: The shape of a distribution curve changes when you multiply a random variable by a constant.

• True

• False

True or False: Adding or subtracting constants can change the shape and measures of spread (range, IQR, standard deviation).

• True

• False

What are the effects of multiplying by a constant (b) on a random variable?

• Changes the shape of the distribution

• Shifts the measures of spread by b

• Multiplies the measures of spread by b

• Shifts the center and location by b