STAT 101 Lecture Notes - Lecture 3: Histogram, Unimodality, Minimax

• School: Iowa State University
• Department: Statistics
• Course: STAT 101
• Professor: haleyjeppson

Document Summary

Divides the values into equal bins: stem-and-leaf display. Stem- contains the rest of the values4 itative. Interpreting histograms and stem and leaf displays: shape- number of modes (peaks) Skewed to the right more smaller values trails off to the larger values (skewed means right is smaller) Skewed to the left- more larger values- trails off to the smaller values (means left is smaller: outliers (extreme values) Center: median- middle value that divides histograms into two parts. Add up all the values and divide by how many points. Mean and median are different when the distribution is skewed or outlier are present. Report range and ior when reporting median. Spread: spread- how spread out are the data points, range- max-min, interquartile range- measures variation (spread) We will divide the data into quartiles ( four equal parts) (min)------------- (25th percentile)-------------(median) ------------- (75th percentile) --------------(max) 5-number summaries: 5-number summary- reports median, quartiles, and max and min.