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18 Cards in this Set
- Front
- Back
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What is Hypothesis?
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A statement about a population parameter subject to verification
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What is Statistical Hypothesis?
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A statement about one or more parameters of a population distribution that requires verification
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What are the characteristics of a Hypothesis?
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the events are mutually exclusive
-if one is true the other one is false |
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What is a Null Hypothesis and Alternative Hypothesis?
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1.all have equal signs
2. all have no equal signs Never conclude that the null value is true because its a continuous variable |
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What are the three characteristics of rejecting null hypothesis?
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1. The particular sample is not representative of the population
2. The experimental methodology is not sufficiently sensitive to detect the true situation 3. The sample is too small |
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What is the 5 step Procedure for Testing a Hypothesis?
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State the null hypothesis and alternate hypothesis
Specify an acceptable risk of rejecting the null hypothesis when it is true Determine the Critcal Value Select a test statistic Decision rule statement and graph Make a decision on whether to reject or not reject |
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What is the level of significance?
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the probability of rejecting the null hypothesis when it is true
states when the null hypothesis is too far away -Type 1 Error |
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What is the Critical Value?
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dividing point between the region where the null hypothesis is rejected and the region where it is not rejected
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What is type 2 error?
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when you do not reject the null hypothesis when the null hypothesis is false
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What is power?
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the probablity of rejecting the null hypothesis when it is actually false
1 - B |
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When to use the Z test for the test statistic?
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Variance is known
For Proportions |
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When to use the T test for the test statistic?
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Variance is not known
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When to use two sided test?
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testing equals versus not equals
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When to use one sided test?
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greater than versus less than
more powerful |
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What are the values for the weight of evidence?
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p<.10 some evidence
p<.05 strong evidence P<.01 very strong evidence p<.001 extremely strong evidence |
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How to determine whether to reject or not reject?
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Compre the p-value to alpha
Compare the test statistic to the critical value |
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What is the null value?
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the value that is being tested
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What are the assumptions for each teset statistic?
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Z test mean - sample is large or normal
Z test proportion- population is binomial T Test- normal or approximately normal |
