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booklet 2, paper 2 - Coggle Diagram
booklet 2, paper 2
errors
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avoiding errors
making the significance levels stricter reduces the chance of a type 1 error but will increase the chance of making a type 2 error
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sign test
when to use
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This test is used when a Repeated Measures experimental design has been used. (i.e. the same participant has 2 results). This means the data is paired or related.
It can also be used when a Matched Pairs design has been used (using the pairs of participants as one person tested twice).
how to calculculate
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2) 2. Represent each pair of data with a plus or minus, to work out the calculated value of
S = number of times the least frequent sign occurs.
3) 3. Look up the critical value of S in the table (you will be provided with this). To do this, you will need to know N (total number of scores giving a sign) and whether the test hypothesis is one-tailed (directional) or two-tailed (non-directional).
4) 4. Compare the critical value of S with your calculated value of S – following the rule stated under the table of critical values.
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