Descriptive statistics Flashcards
what are measures of central tendency?
methods of estimating mid point scores in sets of data
what are the three measures of central tendency?
mean
median
mode
eval median
S: not affected by extreme scores or anomalies
can be used in ordianl data unlike mean
W: not as sensitive as the mean as not all data is taken into account
can be unrepresentative in a small set of data
eval mean
S; most accureate measure of central tendency
uses all data in calculations
W: less useful if some scores are skewed/ anomalies
mean score might not be part of the data
eval mode
S: less prone to distortion by extreme scores
W; can be more than one mode in a set of data
doesn’t use all the scores
what are measures of dispersion?
measurements of the spread of scores with a set of data.
what is standard deviation?
used to show how data is distributed around the central point( mean)
eval standard deviation
S: is a more sensitive dispersion measure than range bc all scores are used
W: allows for the interpretation of individual scores
sidenote- the larger the spreader of scores teh greater the standard deviation.
other measures of dispersion?
range
percentages
correlational data