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RFC1 part 3
Data Analyis Chapters 12-13
Question | Answer |
---|---|
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. |