Stats final review chapter 2
A frequency table
is a grouping of qualitative data into mutually exclusive (distinctive) classes showing the number of observations in each class.
A bar chart
it graphically describes a frequency table using a series of uniformly wide rectangles.
A pie chart
it graphically describes a frequency table using a circle that is divided into slices.
A frequency distribution
is a grouping of quantitative data into mutually exclusive classes showing the number of observations in each class.
Class midpoint
The midpoint is halfway between the lower limits of two consecutive classes. It is computed by adding the lower limits of consecutive classes and dividing the result by two.
Class interval
To determine the class interval, subtract the lower limit of the class from the lower limit of the next class. You can also determine the class interval by finding the difference between consecutive midpoints.
Relative Frequency Distribution
A relative frequency distribution converts each frequency to a relative frequency.
A histogram
Depicts each class as a rectangle, with the height of the rectangular bar representing the number in each class.
A frequency polygon
Allows us to compare directly two or more frequency distributions by constructing one on top of the other.