Graphs/Displays
A graph that shows a bar above each score or interval with the height corresponding to the frequency and the width extending to the real limits. There are no spaces between adjacent bars.
What is a histogram?
The scores are piled up on the left side and taper off to the right
The distance from the highest to the lowest score. (From the upper real limit to the lower real limit).
What is the range?
Scores are grouped into intervals rather than listed as individual values.
What is a grouped frequency distribution?
p = f/n
What is the equation for solving proportion?
A graph that shows a bar above each score or interval with the height corresponding to the frequency. There is space left between adjacent bars.
What is a bar graph?
The scores are piled up on the right side and taper off to the left
What is a negatively skewed distribution?
When a score is identified by its percentile rank, the score is called a _________.
What is a percentile?
Shows the proportion of the total distribution rather than the absolute frequency. This is used in population distributions where the absolute number of subjects is unknown for each category.
What is relative frequency?
p(100) = (f/n)(100)
What is the equation for solving percentage?
A graph with lines that connect a series of dots. These dots are placed above each score or interval with the height corresponding to the frequency.
What is a polygon?
In this type of distribution, it's possible to draw a vertical line through the middle so one side of the distribution is a mirror image of the other.
What is symmetrical distribution?
The percentage of individuals in a distribution with scores at or below the particular value.
Represents the accumulation of scores as you move UP the scale.
What is the cumulative frequency (cf)?
? = (cf/N)(100%)
What is the equation for solving the cumulative frequency (c%)?
A technique where each score is separated into two parts. For example, X = 48 would be separated into 4 and 8.
What is a steam and leaf display?
A section on either side of a distribution where the frequency tapers down to zero.
What is the tail of a distribution?
A group of scores in a grouped frequency distribution.
What is a class interval?
Shows the percentage of scores accumulated as you move UP the scale.
What is the cumulative percentage (c%)?
In a Grouped Frequency Distribution table:
? = highest - lowest + 1
What is the process for calculating the number of ROWS needed when the scores are whole numbers?
A sample of students at a college campus take surveys to determine their personality type, either A, B, or C. The frequency of each personality type is calculated. These findings are organized on a _______.
What is a bar graph?
A graph compares the frequency of points made per player during an NBA game, with intervals increasing by 5 points along the X-axis (0, 5, 10, 15, 20, 25, 30 points). Most players make between 10-15 points a game with only a few making 25-30 points. This is an example of a __________ skewed distribution.
What is a positively skewed distribution?
Values of scores that are the highest and lowest in an interval.
What are apparent limits?
A procedure used to estimate unknown intermediate values within the intervals
What is interpolation?
fraction = (distance from top of interval)/(interval width)
then,
distance = (fraction)(width)
What is the process for solving interpolation?