Unit 2

Question 1

what is the response variable?

Variable whose val…

Answer 1

variable whose value can be explained by value of explanatory/predictor variable

Question 2

what is a scatter diagram?

Answer 2

graph that shows relationship between 2 quantitative variables measures on same individual

Question 3

Two variables that are linearly related is called; positively associated if:

Answer 3

whenever value of 1 variable increases, value of other variable also increases

Question 4

Two variables that are linearly related is called; Negatively associated if:

Answer 4

whenever value of 1 variable increases, value of other variable decreases

Question 5

what is linear correlation coefficient?

Measure of…

Answer 5

measure of strength and direction of linear relation between 2 quantitative variables

Question 6

what is least-square regression line?

Answer 6

line that minimizes sum of squared errors

Question 7

what is law of large numbers?

Answer 7

As number of reps of probability experiment increases; proportion gets closer to probability of outcome

Question 8

what is Experiment?

Answer 8

any process that can be repeated in which results are uncertain

Question 9

what is Sample space, S of a probability experiment?

Answer 9

collection of all possible outcomes

Question 10

what is Event?

Answer 10

any collection of outcomes from probability experiment, may consist of 1+ outcomes

Question 11

what is a probability model?

Lists possible outcomes of

Answer 11

lists possible outcomes of probability experiment and each outcome’s probability

Question 12

If an event is impossible, what is probability?

Answer 12

0

Question 13

if an even is a certainty, what is probability

Answer 13

1

Question 14

what is unusual event

Answer 14

event that has low probability of occurring; probability less than 0.05

Question 15

what is Empirical Method

Answer 15

probability of event E is approximately number of times event E is observed, divided by number of repetitions of experiment

Question 16

what is Classical method?

Answer 16

If an experiment has n equally likely outcomes and if number of ways that an event E can occur is m

Question 17

what happens when 2 events are disjoint or mutually exclusive?

Answer 17

no outcome in common

Question 18

what is a random variable?

Answer 18

numerical measure of outcome of probability experiment, so its value is determined by chance

Question 19

Two events E and F are independent if…

Answer 19

occurrence of event E doesn’t affect probability of event F

Question 20

what is a Discrete random variable

Answer 20

either finite or countable number of values

Question 21

what is a Continuous random variable?

Answer 21

has infinitely many values

Question 22

what is probability distribution?

Provides possible…

Answer 22

provides possible values of random variable X and their corresponding probabilities

Question 23

what is a binomial probability distribution?

Discrete probability…

Answer 23

discrete probability distribution that describes probabilities for experiment in which there are only 2 outcomes