Statistics Chapter 2 Questions & Answers

Statistics Chapter 2 Questions & Answers A _____ chart is useful for displaying a frequency distribution for a nominal variable. - ANSWER: Bar A _____ chart is useful for displaying a frequency distribution for a qualitative variable. - ANSWER: Bar A ______ chart is useful for displaying a relative frequency distribution. - ANSWER: Pie A ___________ is useful for displaying the relative frequency distribution for a nominal variable. - ANSWER: Pie chart A class interval, or class width, can be determined by subtracting the lower limit of a class from the lower limit of the next higher class. - ANSWER: True A class relative frequency represents a __________ of the total observations in the class. - ANSWER: Proportion or percentage A cumulative frequency distribution is used when we want to determine how many observations lie above or below certain values. - ANSWER: True A frequency distribution for nominal data requires that the categories be ___________________ and _____________________. - ANSWER: Exhaustive; mutually exclusive A frequency distribution for qualitative data has class limits. - ANSWER: False A frequency distribution groups data into classes showing the number of observations in each class. - ANSWER: True A frequency polygon is a very useful graphic technique when comparing two or more distributions. - ANSWER: True