STATS 250 Midterm: Stats 250 Exam 1

• School: U of M
• Department: Statistics
• Course: STATS 250
• Professor: Brenda Gunderson

Document Summary

Ordinal if the bar graphs appear in a certain order. The way the tail is pointing is the direction of skew. Spread: variability, range, where to find most observations. Ex: approximately symmetric and unimodal bell shaped most observations centered around (6- Boxplot: graphical representation of five number summaries. Label axis with values to cover min and max. Make box with ends @ q1 and q3. Q1/q3 +/- 1. 5 x iqr if they"re more than this value, they"re outliers. Extend lines from min to max (not outliers) If there are outliers, draw line to next biggest/smallest value, not just the. Sensitive to extreme observations moves towards larger observations. Ex. skewed right means that median > mean. Range: measures spread over 100% of data (max - min) Interquartile range: measures the spread over middle 50% of data. Percentile so that a certain percent of data balls at or below the value. Median - 50%, first quartile 25%, second quartile 75%