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17 Cards in this Set
- Front
- Back
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What 3 things does a z distribution have? |
1) It's normal 2) Have a mean of zero 3) Have a SD of 1 |
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What are the two things z-scores are used for in descriptive stats? |
1) Finding the relative position of the data 2) Allowing comparison between scores from different distributions. |
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How do Z distributions help in comparisons between distributions? |
They provide a universa scale of measurement that the distributions can be transformed into for comparison |
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What does a z dist. allow interpretation of? |
-Relative standing to the mean -Variablity |
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What is correlation? |
Examining the relationship between 2 or more variables to see if the is one true one If there is the variables are correlated |
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Correlations can be made between only Dependent variables. T or F? |
True: Can do in with independent variables |
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What can and cant correlations do? |
-Can: Descr |
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What does +ve and -ve describe about a correlation? |
The direction |
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What is usually on the x and y axis of a correlation scatterplot? |
X = the predictor value Y = The other one |
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The weaker the correlation the more the variability. T or F? |
True |
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What tells the strength of a correlation on a scatterplot? |
How close the points are to the trend line |
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What does the Pearson R test capture and what in it represents these? |
The strength (-1 to 1) and the directions (negative and positive) |
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What scales must a variable be on for the Pearson R? |
Interval or ratio |
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The Pearson R can detect all relationships. T or F? |
False: Only detects linear relationships |
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The Pearson R requires large range of variables. T or F? |
True: Smaller ones have more variability |
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What does the cross-lagged-panel procedure do,assume and allow? |
It assumes that variables will be stronger over time, looks at interactions between variables over time and allows us to look over time |
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Cross-lagged-panel procedure tell us causality. T or F? |
False: Only gives an idea |
