Stat 101 Chapter 3 with Questions and Answers, Exams of Statistics

Stat 101 Chapter 3 with Questions and Answers Display the distribution of a quantitative variable with; ANSWER Histogram, stem-leaf plot, and dot plot Distribution is described in terms of; ANSWER Shape, center and spread. Symmetric ANSWER Distribution has roughly the same shape reflected around the center. (Shape description stops at a gap.) Skewed ANSWER Distribution extends farther on side than the other. Skewed Right = More Smaller Values Skewed Left = More Larger Values (L=L) Unimodal ANSWER Distribution has a single major hump or mode. Bimodal = 2 humps or modes Multimodal = +3 humps or modes Outliers ANSWER Values that lie far from the rest of the data. Unusual Distribution Feature ANSWER Gaps Use Mean to; ANSWER Summary for unimodal, symmetric distributions Use Median to; ANSWER Summary when the distribution is skewed or has outliers