Flashcards in Exam 3 - Hypothesis Deck (12):

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## A statistical hypothesis

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

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## Null hypothesis

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

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## Alternative hypothesis is

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

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## 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

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## Hypothesis tests find stat answers to

### Questions about our processes and products

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## Alpha is

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

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## 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

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## If p-value is less or equal to alpha

### Reject the null hypo and the results are stat significant

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

### Not always

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## Power

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

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## Beta is

### The probability of making a type II error

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