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RFC1 part 3
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RFC1 part 3
Data Analyis Chapters 1213
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. 
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