# Statistics Ch. 8 Flashcards

Set Details Share
created 10 years ago by kategre18
892 views
College: First year, College: Second year, College: Third year, College: Fourth year
Subjects:
probability & statistics
Page to share:
Embed this setcancel
COPY
code changes based on your size selection
Size:
X

1

statistical hypothesis

a conjecture about a population parameter

2

null hypothesis

a statistical hypothesis that states that there is no difference between a parameter and a specific value

3

alternative hypothesis

a statistical hypothesis that states the existence of a difference between a parameter and a specific value

4

hypothesis testing

a decision making process for the population under study

5

statistical test

uses the data obtained from a sample to make a decision about whether a null hypothesis should be rejected

6

test value

the numerical value obtained from a statistical test

7

type I error

occurs when you reject the null hypothesis when it is true

8

type II error

occurs when you do not reject the null hypothesis when it is false

9

level of significance

the maximum probability of committing a type I error

10

probability of a type I error symbol 11

probability of a type II error symbol 12

critical value

separates the critical region from the noncritical region

13

critical region

the range of values of the test value that indicates there is a significant different and the null hypothesis should be rejected

14

noncritical region

the range of values of the test value that indicates that the difference was probably due to chance and that the null hypothesis should not be rejected

15

one-tailed test

the null hypothesis should be rejected when the test value is in the critical region on one side of the mean

16

two-tailed test

the null hypothesis should be rejected when the test value is in either of the 2 critical regions

17

z-test

a statistical test for the mean of a population

18

p-value

the probability of getting a sample statistic or a more extreme sample statistic in the direction of the alternative hypothesis when the null hypothesis is true

19

t test

a statistical test for the mean of a population & is used when the population is normally or approximately normally distributed