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Flashcards in W5 Deck (17):
1

probability

the mathematical likelihood of a given event occuring, ranges from 0-1

2

statistical significance

a difference that is large enough that it is not likely to have occured because of chance or sampling error

3

mathematical difference

if numbers are not exactly the same, they are different

4

mathematically important differences

if the difference is sufficiently different

5

hypothesis

a prediction of what outcome will occur in the population, using the sample

6

the null hypothesis (H0)

the opposite of your prediction, there is not enough evidence to conclude a difference

7

the alternative hypothesis (H1)

there is enough evidence to suggest a relationship

8

the larger the difference between the two variables.. the greater the likelihood the null hypothesis is true OR false

false

9

decision rule

rule or standard used to determine whether to reject or accept the null hypothesis

10

state the types of error

type 1 error
type 2 error

11

type 1 error

rejection of the null hypothesis when in fact it is true

12

type 2 error

failure to reject the null hypothesis when in fact it is false

13

two-tailed tests

testing for the possibiity of a relationship in both directions

14

one-tailed tests

testing for rejection on one side of the sampling distribution

15

independent samples

samples in which measurement of a variable in one population has no effect on measurement of a variable in another

16

related samples

samples in which measurement of variable in one population may influence measurement of the variable in another

17

degrees of freedom

number of observations in a statistical problem that are free to vary