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.