STAT202 Lecture Notes - Lecture 1: Quartile, Interquartile Range, Statistical Inference
Document Summary
Numerical summary measures for techniques: tables, graphs (quantitative or categorical variables) data sets, central tendency, variation (quantitative variable) (ii) statistical inferences. When the data obtained in the study of a population are used to draw general conclusions about the population itself we call this statistical inference. To calculate the average of a data set, add all the values, then divide by the number of individuals this is the balance point . The median is a measure of center that is resistant to skew and outliers the mean is not. The spread, or the distance, between the smallest and largest values of a variable. Depends only on the two extreme observations they may be outliers. Range = maximum minimum: quartiles. Q1: larger than 25% of the observation . Q2 (median): larger than 50% of the observation. Q3: larger than 75% of the observation .
