Statistics Chapter 1 Questions & Answers

Statistics Chapter 1 Questions & Answers Advantages of bar graph when compared to a pie chart - ANSWER: Both graphs can display the distribution of a categorical variable, but a bar graph can also compare any set of quantities that are measured in the same units. Are quartiles/IQR resistant? - ANSWER: Yes because they are not affected by a few extreme observations Association - ANSWER: There is an association b/w 2 variables if specific values of one variable tend to occur in common with specific values of the other Average value vs. typical value - ANSWER: Mean (balancing point) vs. median (equal areas) Back-to-back stem plot - ANSWER: To compare stem plots use common stems; leaves on each side are ordered out from each common stem Bar graph/chart - ANSWER: Bar graphs represent each category as a bar. The bar heights show the category counts or percents. Bar graphs are easier to make than pie charts and are also easier to read. Bimodal - ANSWER: Graph has two clear peaks Box plot vs. modified box plot - ANSWER: "Modified" box plot shows outliers while standard box plot does not. Box plot/box and whisker plot - ANSWER: 1.) Central box drawn from Q1 to Q3 2.) A line in the box marks the median 3.) Lines (whiskers) extend from box out to smallest and largest observations that aren't outliers *Outliers denoted with star Case - ANSWER: Another name used for individual Categorical variable - ANSWER: Places an individual into one of several groups or categories Center - ANSWER: Describe using median (middle value; divides observations so half take large values and half take smaller values) Describe use mean (average)