Chapter 2 Flashcards
What are the important properties of frequency histogram
Horizontal scale is quantitative measures the data values
Vertical scale measures frequencies of classes
Consecutive bars must touch
How do you create a frequency distribution
Find the range Divide by the number of classes Roundup and that's how you find the class width
Relative frequency histogram
Same as frequency Instagram although why axis has the relative frequencies
What must you keep in mind when making a stem and leaf display
The key
What are the types of qualitative data
Pie chart and Pareto chart
How do you make a pie chart
Add all the data entries together
Divide individual entries into total to find the percentage or the relative frequency
Multiply relative frequency by 360° to see the proportion of the circle
What Is the Peretto chart how do you make it
Bargraph for the bars are positioned in order of decreasing height. Highest bar first
The X axis contains words
The Y axis contains numbers
The bars do not touch
What are the components of a frequency distribution
Classes Range Lower class limit Upper class limit Class width Class boundaries Class midpoint
Are the classes of a frequency distribution
Intervals of the data entries
What is the range
Highest entry minus the lowest entry
What is the lower-class limit
Least number that can belong to a class
What is the upper-class limit
Highest number that can belong to a class
What is the class width
Distance between the lower and the upper-class limits
it is the range divided by the class number
What are the class boundaries
Numbers that separate classes without forming gaps
The .5’s
How do you find the class midpoint
Some of the upper and lower limit and then divided by two
What are the measures of central tendency
Mean median mode midrange
What is the mean
X with line over it
Sum of all data divided by the number of data values
How do you find the mean for a frequency distribution
Sum of XF column divided by the sum of the F column
What is the median
X with tilde
The middle number is long as the numbers are in order
How do you find the median for frequency distribution
Add The F column and then divide by two
What is the mode
Most frequent number
What is the midrange and how you find it
The middle of the range of data
Highest number plus the lowest number divided by two
What measures of central tendency are affected by outliers
The mean and the midrange
What is an outlier
The data entry that is far removed from the other entries in the dataset
