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# RFC1 part 3

### Data Analyis Chapters 12-13

Mean average of numbers added together and divided interval
median arrange numbers in order the number the middle number is the median for odd, for even add two middle numbers divided by 2 ordinal
mode the number that repeats itself, if no number repeats then there is no mode.ordinal nominal
range simply the difference between the highest and lowest scores
quartile deviation one half of the difference between the upper quartile and the lower quartile.
variance defined as the amount of spread among scores.
standard deviation square root of the variance of a set of scores.
normal curve small # of a's and f's more b's and d's and lots of c's
skewed distributions distribution is not normal it is said to be skewed.
percentile rank percentage of scores that fall at or below a given score.
standard scores calculation that expresses how far an individual student's test score is from the mean
z score most basic and most used standard score. how far a score is from the mean. z score = 0
t score used to proved an easier to understand score that is standardized without pluses or minuses and is derived by multiplying the z score by 10 and adding 50
Pearson r coefficient (for interval and ratio data) correlation coefficient is the most propriate measure when the variables to be correlated are expressed as either interval or ration data.
Spearman Rho correlate ranked or ordinal data
stanines standard scores that divide a distribution into nine parts.
Frequencies frequency at which data is collected at regular intervals. This often refers to whatever time of the day or the year in any given length of period.
type I error reject the null hypothesis when the null hypothesis is true
type II error accept the null hypothesis when the null hypothesis is false
Hypothesis an explanation for the occurrence of certain behaviors, phenomena, or events; a prediction of research findings.
Created by: hday