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MWSU NUR 314 CH4 QA/Stats
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Terms in this set (24)
Descriptive statistics
includes procedures for summarizing data, describing average value of data set.
measures of central tendency
Mean, Mode and Median
Mean
M "the average"
Mean (statistical notion formula)
M=EX/N -Where E=Sigma, sum of set of scores divided by number of scores
Outlier
extreme score, big effect on mean
Mode
most frequently occurring score in the data set, not effected by outlier
Median
Middle point, Not effected by outlier, Even # of data--50% above and 50% below, even number of data--calculate median by adding the two middle score and divide by two
Mean used when...
data is measured at the interval or ratio level and the distribution is approximately symmetrical
Mode is used when...
average is needed for a data set measured at the nominal level
Median is used when...
distribution is skewed or with ordinal data
Pathway for SPSS for mean, median, mode
Analyze, Descriptive Statistics, Frequencies, Statistics, select option, Continue, OK
Modality
Peaks on the frequency polygon
On a frequency polygon, what is the peak of the graph?
Mode
Unimodal
one peak
bimodal
two peaks
Skewness
distribution located more on one side than the other side
asymmetrical distributions
peak either right or left
positively skewed
tail is on the right side (hump is on the left)
negatively skewed
tail is on the left size (hump is on the right)
normal distribution
skewness score of 0, kurtosis score of zero, skewed neither right nor left, all just in theory, no way to measure everyone.
kurtosis
shape of a curve in terms of height
positive kurtosis
leptokurtic
negative kurtosis
platykurtic
pathway on SPSS for Skewness, Kurtosis
Analyze, Descriptive Statistics, Descriptives, move variables, Options, click skewness and kurtosis, Continue, OK
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