STAT 2 Lecture Notes - Lecture 4: Interquartile Range, Quartile, Adipose Tissue
Document Summary
The mean is the value at which 50% of the data lie to the left and 50% of the data lie to the right. The average is equal to the sum of all the data, divided by the number of entries. Cross-sectional studies when u take a statistical sample that was taken at one point in time. Iqr interquartile range 3rd quartile minus 1st quartile. The higher the iqr, the more dispersed the data is. First quartile data point such that 25% of the sample is lower than the point. Third quartile data such that 75% of the sample is lower than the point. Step 2: calculate deviation for each number in list from mean. Step 4: find the average of all these numbers. Step 5: take the square root of the sum. Z-scores expressing an observation in standard units to say how many standard deviations above or below the average a data point is.
