PSCI 2702 Lecture Notes - Standard Deviation, Central Tendency, Sampling Bias
7 Jul 2014
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Class 3 psci2702a january 22, 2014. Measures of central tendency are not enough; two distributions of data can have similar measures of central tendency, but with vastly different values. Consistency in the data or values are close to the average value. High standard deviation is less constant, low standard deviation is more consistent. *on exam, know about deviation calculations ( x i x and why you subtract these. Standardization is the step or procedure of calculating scores with a different measure (e. g. , instead of kilometers, miles): *on exam: in statistics, the mean becomes 0, and the standard deviation is 1 (refer to normal curve chart). Why do we standardize scores: so it is more simple to see if a value is below average (whether it is -1, -2, or -3). X standard deviations above or below the mean. In terms of iq, 115 is 1 standard deviation above (1x15).
