Unit 2 Flashcards
what is the response variable?
Variable whose val…
variable whose value can be explained by value of explanatory/predictor variable
what is a scatter diagram?
graph that shows relationship between 2 quantitative variables measures on same individual
Two variables that are linearly related is called; positively associated if:
whenever value of 1 variable increases, value of other variable also increases
Two variables that are linearly related is called; Negatively associated if:
whenever value of 1 variable increases, value of other variable decreases
what is linear correlation coefficient?
Measure of…
measure of strength and direction of linear relation between 2 quantitative variables
what is least-square regression line?
line that minimizes sum of squared errors
what is law of large numbers?
As number of reps of probability experiment increases; proportion gets closer to probability of outcome
what is Experiment?
any process that can be repeated in which results are uncertain
what is Sample space, S of a probability experiment?
collection of all possible outcomes
what is Event?
any collection of outcomes from probability experiment, may consist of 1+ outcomes
what is a probability model?
Lists possible outcomes of
lists possible outcomes of probability experiment and each outcome’s probability
If an event is impossible, what is probability?
0
if an even is a certainty, what is probability
1
what is unusual event
event that has low probability of occurring; probability less than 0.05
what is Empirical Method
probability of event E is approximately number of times event E is observed, divided by number of repetitions of experiment
what is Classical method?
If an experiment has n equally likely outcomes and if number of ways that an event E can occur is m
what happens when 2 events are disjoint or mutually exclusive?
no outcome in common
what is a random variable?
numerical measure of outcome of probability experiment, so its value is determined by chance
Two events E and F are independent if…
occurrence of event E doesn’t affect probability of event F
what is a Discrete random variable
either finite or countable number of values
what is a Continuous random variable?
has infinitely many values
what is probability distribution?
Provides possible…
provides possible values of random variable X and their corresponding probabilities
what is a binomial probability distribution?
Discrete probability…
discrete probability distribution that describes probabilities for experiment in which there are only 2 outcomes
