Flashcards in Unit 1 Deck (21)
P(B|A) = "the probability of B, given A"
(amount 1)(prob 1)+(amount 2)(prob 2)+etc..
The probability that 2 events will occur in sequence is
For independent events it is
Gather data by watching or looking at records of what's already happened. No influence or manipulation.
Used to take information from a small group and meant to represent the entire population. Can bias easily.
number of outcomes in event E
number of outcomes in sample space
Outcomes that are not included in Event E
Range of Probabilities Rule
To change a variable within a controlled environment and measure the changes.
Measurements are taken from the entire population. Least popular. Key words: whole, everyone, entire.
P(A or B)= P(A)+P(B)
The result of a single trial in a probability experiment.
Consists of one or more outcomes and is a subset of the sample space.
The set of all possible outcomes of a probability experiment.
P(A or B)= P(A)+P(B)–P(A and B)
Something is random if there is a equal chance of being chosen, and people are chosen without regard to characteristics. If not, results are biased.
To make general conclusions about a populations based on a sample.