Exam 3 - Hypothesis Flashcards Preview

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Flashcards in Exam 3 - Hypothesis Deck (12):
0

A statistical hypothesis

Is a claim about a population parameter and determines what we actually test

1

Null hypothesis

Is a hypothesis that states that population parameter, such as population mean, equals a specified value or a parameter from another population

2

Alternative hypothesis is

the opposite of null hypothesis, so it states that the population parameter does not equal a specified value or another parameter

3

The alternative hypothesis can be directional or

One-sided, that is we suspect that the population parameter is greater than or less than some value

4

Hypothesis tests find stat answers to

Questions about our processes and products

5

Alpha is

The probability of rejecting a null hypothesis that is true. Always select before performing the hypothesis test

6

P-value is the area to the right of the test statistic, it is a

Probability of obtaining a test stat that is at least as extreme as the calculated value if the null hypothesis is true

7

If p-value is less or equal to alpha

Reject the null hypo and the results are stat significant

8

P-values indicates wether our results are stat significant, does it mean they are practically significant?

Not always

9

Power

Is likelihood that we will find a significant effect when one exists

10

Beta is

The probability of making a type II error

11

Alpha is

The probability of rejecting a null hypothesis that is true