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34 Cards in this Set
- Front
- Back
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in normal distribution ____ % of the population is within 1 std deviation of the mean
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68
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MU=
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population mean
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in positive skew scores bundle on the
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left hand side
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in positive skew the distribution has a longer tail to the
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right
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in negative skew tail extends to the
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left
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kurtosis (leptokurtic) means ____
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leaping, majority of the scores concentrated around the mean
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In _____ distribution is peaked in shape
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kurtosis (leptokurtic)
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Kutosis (platykurtic) means
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plateau
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in a platykurtic distribution more scores are located at
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extremes of the distribution
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in platykurtic distribution the top of the graph is more
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rounded
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if distribution is not normal it can cause problems with many
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statistical tests
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in most cases the larger the sample the better chances for
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normal distribution
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if distribution is not normal, all
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hope is lost
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if distribution is not normal you may use _____ or ______ statistics
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transformation (logarithmic) or alternative (non parametric)
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just as a sample is an estimate of the population the _______ are estimates of true population values
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sample statistics
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the larger the sample the more
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accurate the estimate
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_____ & _____ are categorical variables
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discrete groups
descriptives |
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example of discrete groups
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gender ethnicity
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descriptives are the
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sample size and % in each group
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3 types of continuous variables
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central tendency
dispersion confidence intervals |
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the central value of your data
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measures of central tendency
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3 measures of central tendency
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mean/ median/ mode
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_____ measures how variable your data are
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dispersion
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____ measures dispersion
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std deviation
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how far the avg. score is from the mean
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std. deviation
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a range of value that we are X percent confident include the population mean
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confidence intervals
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the mode is the
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most common value
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the range is the difference between
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lowest and highest values
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variance is 0 when all the ______ are the same
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observations
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confidence intervals describe the
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MARGIN OF ERROR
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the correlation coefficient is credited to
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karl pearson
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____ measure the degree of linear association between 2 variables
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the correlation coefficient
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the ______ ranges from -1.0 to 1.0
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the correlation coefficient
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commonly used rule of thumb for the correlation coefficient:
+/- .10 is +/- .30 is +/- .50 is |
small
medium large |
