STATS CH 2
Suppose a person claims that 4.2% of all people in the nation always eat out. is this a descriptive or inferential statement?
Inferential
The ______ class limit is the smallest value within the class and the ______ class limit is the largest value within the class.
lower - upper
A frequency distribution lists the ______ of occurrences of each category of data
number
A relative frequency distribution lists the ______ of occurrences of each category of data.
proportion
What is a bar graph? What is a Pareto chart?
A bar graph is a horizontal or vertical representation of the frequency or relative frequency of the categories. The height of each rectangle represents the category's frequency or relative frequency. A Pareto chart is a bar graph whose bars are drawn in decreasing order of frequency or relative frequency.
What is an ogive?
A graph that represents the cumulative frequency or cumulative relative frequency for the class
What type of variable is required when drawing a time-series plot? Why do we draw time-series plots?
A quantitative variable is required when drawing a time series plot.Identify trends in data over time.
In a relative frequency distribution, what should the relative frequencies add up to?
The relative frequencies add up to 1
If a polling organization claimed that the results of the survey indicate that 77% of adults in the country believe that the action is acceptable in certain situations, would you say this statement is descriptive or inferential? Why?
The statement is inferential because it makes a prediction.
Is the statement below true or false? There is not one particular frequency distribution that is correct, but there are frequency distributions that are less desirable than others.
The statement is true. Any correctly constructed frequency distribution is valid. However, some choices for the categories or classes give more information about the shape of the distribution.
The _________________ is the difference between consecutive lower class limits.
class width
When plotting an ogive, the plotted points have x-coordinates that are equal to the upper limits of each class.
True
