Chapter 7 - AP Statistics

Front

What is the difference between a discrete random variable and a continuous random variable?

Back

A discrete random variable has a fixed set of possible values with gaps between while a continuous random variable takes all values in an interval of numbers.

Front

What are the two types of random variables?

Back

Discrete and Continuous

Front

The count of X successes in a binomial setting is a: Binary outcome, Binomial probability, Binomial distribution, Binomial random variable

Back

Binomial random variable

Front

To find the mean of a binomial random variable, what should you do? Options: Multiply the probability of success times the probability of failure., Multiply the number of trials times the probability of failure, Multiply the number of trials times the probability of success., Multiply the number of trials times the probability of success times the probability of failure.

Back

Multiply the number of trials times the probability of success.

Front

To find the mean/expected value for a geometric random variable, what should you do? Options: Multiply the number of trials times the probability of success on each trial., Divide 1 by the probability of success on each trial., Multiply the number of trial times the probability of failure on each trial., Divide 1 by the probability of failure on each trial.

Back

Divide 1 by the probability of success on each trial.

Front

A  ____________ consists of repeated trials of the same chance process in which each trial results in a success or a failure, trials are independent, each trial has the same probability of success, and the goal is to count the number of trials until the first success occurs.

Back

Geometric setting

Front

Which of these pairs of random variables are most likely independent: X= Average house size in acres and Y= Average weight of people living in that town, X= Average house size in acres and Y= Average annual income, X= Average height of people living in that town and Y= Average weight of people living in that town, X= Average monthly mortgage payment and Y= Average annual income?

Back

X= Average house size in acres and Y= Average weight of people living in that town

Front

If knowing whether any event involving X alone has occurred tells us nothing about the occurrence of any event involving Y alone, then X and Y are

Back

Independent Random Variables

Front

What does this formula calculate: x1p1+x2p2+x3p3+...=Σxipi?

Back

Mean and Expected Value

Front

Is this a binomial setting? : Shuffle a deck of cards, turn over the first 7 cards, one at a time. Let Z= the number of Kings you observe

Back

No, because the probability of success is not the same for each trial