Chapter 5 and 6 Stats Study Guide

If two events are independent, then the probability that both events equals

The product of the individual properties

The probability of randomly selecting a spade from a deck of cards is

.25

The odds against a horse winning a race were set at 7 to 1. The probability of that horse not winning the race is

.875

The High Roller Casino puts the odds of a certain baseball team winning the world series at 1 to 30 (1:30). Based on those odds, what is the probability that this baseball team will win the World Series?

0.032

Let P(A)=0.30 and P(B)=0.40. Suppose A and B are independent events. Calculate P(A|B).

0.30

The probability that Anthony is on time for work is 0.90

0.76

5!=?

120

Mike is placing a bet on an upcoming horse race in which seven horses are running. Mike places a trifecta bet that wins only if he correctly picks the first, second, and third place horses in order. In how many different ways can mike select three horses when order matters

210

The relative frequency of an event is used to calculate what type of probability?

An empirical probability

The ___ probability is the probability of an event given that another event has already occurred.

Conditional

The ___ formula is used to determine the number of different ways to arrange a group of x objects from a total of n objects and the order of the objects is irrelevant.

Combination

Using the multiplication rule, the probability that event A and event B both occur is computed by multiplying the conditional probability of event A given event B by the probability of

Event B

The ___ formula is used to determine the number of possible ways to arrange n items when there are no groups.

Factorial

How many outcomes of an experiment constitute a simple event?

One

The sum of the probabilities of a list of mutually exclusive and exhaustive events is

One

The complement rule with respect to event A is

P(A^C)=1-P(A)

If an event is getting a letter grade A in your statistics class, what is the complement of receiving an A?

Receiving any grade except an A.

T or F: When constructing a joint probability table, the lower right corner must always equal 1.0.

True.

Kareem is trying to decide which college to attend full time next year. Kareem believes there is a 55% change that he will attend State college and a 33% change that he will attend Northern University. The probability that Kareem will attend either State is Northern is _____

a. 0.55 b. 0.88 (Correct) c. 0.18 d. 0.22

For hotels in New York City, a travel web site wants to provide information comparing hotel costs vs the quality ranking of the hotel. A useful way to summarize this data is to construct a

contingency table

The ____ formula is used to determine the number of ways to arrange x objects where the order of the objects matter.

permutation

The addition rule is used to calculate

the union of two events

To calculate the union for two mutually exclusive event A and B

we add the probability of A to the probability of B

The probability of Margaret receiving a promotion is 0.70. The probability of Katia receiving a promotion is 0.60. If the two promotions are independent, then the probability of both Margaret and Katia receiving a promotion is

0.42

The probability that a customer orders popcorn at the movie theater is 0.40. The probability that a customer orders a drink at the movie theater is 0.65. The probability that a customer orders popcorn and a drink is 0.30. If a customer has already ordered a drink, what is the probability that the customer will order popcorn?

0.46

Students who take the College Prep English Course this summer before entering college have a 0.84 probability of achieving a B or better in their freshman english class at college. The odds that the student taking the Prep Course will receive a B or better in the freshman class are

5.25 to 1

For any given event, the probability of that event and the probability of the ___ of the event must sum to one.

Complement

Which of the following is an example of a conditional probability?

The probability that Lisa purchases groceries, given that Neil had already purchases groceries.