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32 Cards in this Set
- Front
- Back
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Inferential Stats |
drawing conclusions about population on basis of sample |
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Inferential Stats involves |
Selecting a sample Treating a sample Determining the likelihood that the sample mean differs from the population mean |
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What is the most commonly used hypothesis testing? |
Inferential procedures |
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Details change in hypothesis testing the general process remains |
constant |
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Hypothesis Test |
a statistical method using sample data to evaluate a hypothesis about a population |
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We base our conclusions on |
a question |
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Unable to reject |
failing to reject prediction |
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Hypothesis Testing considers... |
the probability that the result of the study could have occurred if the experimental procedure had no effect |
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If the probability in a hypothesis testing is low.. |
probability of no effect (Null Hypothesis) is rejected
the theory behind the experimental procedure is considered supported |
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Step 1 of Hypothesis Testing |
restate the hypothesis |
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Step 2 of Hypothesis Tesing |
Determine comparison distribution |
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Step 3 of Hypothesis Testing |
Determine cutoff score |
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Step 4 of Hypothesis Testing |
Determine actual score |
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Step 5 of Hypothesis Testing |
Decide whether to reject or fail to reject the null |
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Ho |
Null hypothesis notation |
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u1=u2 |
Null hypothesis symbols |
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Ha |
alternative hypothesis notation |
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u1=/u2 |
research hypothesis symbols |
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Unlikely level determined
1. 2. |
alpha level we set
makes critical region |
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A probability value that is used to define the concept of very unlikely |
Alpha |
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Critical region |
composed of extreme sample values that are very unlikely |
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Boundaries of the critical region are determined by.... |
the alpha level |
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If the sample score falls within critical region |
the null can be rejected assume had an effect |
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The sample score does not fall in critical region |
fail to reject null assume results are inconclusive |
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Research hypothesis is the hypothesis of 1. 2. 3.
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effect, change, or relationship |
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Directional Hypothesis |
one tailed test |
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Non-directional |
two tailed test |
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Is the one tailed test directional because the direction of the test is predicted? |
true |
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Why is it called one tailed test? |
Hypothesis test looks for an extreme result at just one end of the comparison distribution. + or - |
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Is the direction of the result of a two tailed test not predicted? |
true |
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Why is it called a two tailed test? |
looks for an extreme result at either ends of the comparison distribution |
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If a one tailed test is used and the predicted direction is positive and get decrease |
it cannot be considered significant |
