PS101 Chapter Notes - Chapter 2b: Null Hypothesis, Sampling Distribution, Squared Deviations From The Mean
Document Summary
Commonly used to graphically represent ungrouped frequency distributions frequency polygon a line graph depicting a grouped frequency distribution, which is created by connecting the midpoints of each class of data. Typically used to graphically represent grouped frequency distributions. Measures of central tendency: three most common; mean, median and mode, mean is the average value, median represents the midpoint, mode represents the most frequent or common value in a dataset. Indicators that tell how different the values are within a data set. Standard deviations - square root of the variance standard deviation a deviation value that is the square root of the variance; it is a statistical index of how much scores vary within a group. Effect size effect size a standardized measure that reflects the degree of relationship or size of the difference between two or more variables. Cohe(cid:374)"s d is the (cid:373)ost (cid:272)o(cid:373)(cid:373)o(cid:374) effe(cid:272)t size.
