Chapter 2: Frequency Distributions – Flashcards
Unlock all answers in this set
Unlock answersquestion
Frequency distribution
answer
describes the pattern of a set of numbers by displaying a count/percent for the values of the variables
question
Four different ways to visually describe just one variable
answer
Frequency table, grouped frequency table, frequency histograms, and frequency polygon
question
Frequency tables include
answer
Values, frequency, and percent/proportion
question
Grouped frequency tables
answer
Where the info has been clumped together
question
Histograms
answer
Frequency tables in graph form
question
Frequency Polygon
answer
Histograms that aren't shaded
question
Shapes of Distributions
answer
Unimodal, bimodal, multimodal, and rectangular
question
Positive Skew
answer
Tail to the right, represents floor effects
question
Negative Skew
answer
Tail to the left, represents ceiling effects
question
Kurtosis
answer
How much a distribution deviates from normal by looking at spread
question
Mark is looking at a histogram depicting students placed in various high schools. In this histogram, the x-axis most likely represents the _____ while the y-axis most likely represents the _____.
answer
values of the variable "high school"; frequencies or number of students
question
Dr. Choi is examining the weights of 750 children, 2 to 18 years old, to find out if childhood obesity rates are increasing in his city. With this type of data, is it better to use a frequency table or a grouped frequency table? Why?
answer
A grouped frequency table is better because the data are a large set of continuous intervals.
question
To calculate a percentage in a frequency distribution:
answer
divide the number of participants in a group by the total number of participants and multiply by 100.
question
Why is it sometimes easier to use a frequency table to interpret data than to examine a distribution of raw scores?
answer
Frequency tables display patterns, organizing the data by frequency of scores.
question
What type of graph displays individual data points of one variable both numerically and visually?
answer
stem-and-leaf plot
question
Identify the shape of the distribution of the following scores: 16, 15, 92, 15, 20, 25, 95, 20, 25, 20, 24, and 21.
answer
positively skewed
question
What type of graph involves drawing a line to connect dots representing values or midpoints of classes?
answer
frequency polygon
question
In a distribution that is positively skewed, most of the scores occur __________________ of the distribution.
answer
on the left side
