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20.In a cumulative percent frequency distribution, the last class will have a cumulative percent frequency equal toa.oneb.100c.the total number of elements in the data setAnswer: b21.Data that provide labels or names for categories of like items are known as22.A tabular method that can be used to summarize the data on two variables simultaneously is called23.A graphical presentation of the relationship between two variables is24.A histogram is said to be skewed to the left if it has aa.longer tail to the rightb.shorter tail to the rightc.shorter tail to the leftd.
longer tail to the left
Descriptive Statistics: Tabular and Graphical Presentations 525.When a histogram has a longer tail to the right, it is said to be26.In a scatter diagram, a line that provides an approximation of the relationship between the variables is known asExhibit 2-1The numbers of hours worked (per week) by 400 statistics students are shown below.Number of hoursFrequency0 - 92010 - 198020 - 2920030 - 3910027.Refer to Exhibit 2-1. The class width for this distribution28.Refer to Exhibit 2-1. The number of students working 19 hours or lessa.is 80b.is 100c.is 180d.is 300Answer: b29.Refer to Exhibit 2-1. The relative frequency of students working 9 hours or less30.
Refer to Exhibit 2-1.
The percentage of students working 19 hours or less is
6Chapter Two31.Refer to Exhibit 2-1. The cumulative relative frequency for the class of 20 - 2932.Refer to Exhibit 2-1. The cumulative percent frequency for the class of 30 - 39 isa.100%b.75%c.50%d.25%Answer: a33.Refer to Exhibit 2-1. The cumulative frequency for the class of 20 - 29