Stats Flashcards
Process of administering a test to collect information
measurement
process of placing value judgement on the measurement , involves analyzing scores and using stats to enhance interpretation
evaluation
3 common problems in screening and cleaning errors and unusual scores
- data recording/entry errors- determine whether the score is highly unlikely/impossible ad look into the reason
- outliers- exceptional performance, appropriate population
- missing data
2 way to reduce errors in screening and cleaning errors and unusual scores
- work in pairs to enter data (reader, recorder, repeat)
2. use a numeric keypad to minimize inputting errors
indicates the point around which scores are concentrated, a single score that best represents all of the scores
central tendency
indicates how data points are spread around the centre
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variability
an estimate of the variability between individual scores and the central tendency score
The average of a distribution of scores ◦ Most commonly reported (& most trustworthy) measure of central tendency
mean
The midpoint of a distribution ◦ 50% of the scores lie above and 50% of the scores lie below
median
Most frequently occurring score in a distribution ◦ Useful for highlighting clusters of data
mode
the range and the SD are measures of ______
variability
simplest measure of variability
–> unstable becuase?
- range
- only depends on 2 scores
amount that all scores vary from the mean
- min value?
- the larger the value the greater the ?
- standard deviation
- 0
- variability in scores from the mean?
determines differences between 2 mean scores
T test
determines the differences between multiple mean scores
ANOVA
determines relationships between variables
correlation
