REF 602: chapter 2
d.) The interval width is equal to the number of interval in a frequency distribution
Each of the following is a rule for the simple frequency distribution except: a.)Each interval is equidistant. b.)The same score cannot occur in more than one interval c.) Each interval is defined (it has a lower and an upper boundary). d.) The interval width is equal to the number of interval in a frequency distribution.
False
Histograms are used to summarize ungrouped data, which is why each vertical rectangle touches the other. true or false
Grouped
The number of calories in school lunches in a sample of 32 local middle schools
Grouped
The number of hours of sleep (per night) in a sample of 60 patients being treated for depression.
Ogive
Summarizes the cumulative percent of continuous data at the upper boundary of each interval (dot-and-line)
Bar Chart
Summarizes the frequency of discrete and categorical data in whole units of categories -each category is represented by a rectangle -rectangles do not touch long the x-axis
True
The 360 degrees in a pie chart correspond to 100% of a data distribution. true or false
grouped
The age (in years) of freshman student in a local college
Cumulative Frequency
The frequency of businesses with at least 20 employees
Cumulative Frequency
The frequency of college students with less than a 3.0 GPA.
(Ungrouped Data)
The frequency of each individual score or category ___ ___ in a distribution
Relative Frequency
The frequency of hospital visits (per year) in a sample of diabetics
(Grouped Data)
The frequency of scores falling wthin defined groups or intervals _____ ____ in a distribution (generally more clear)
ungrouped
The handedness (righ-or left-hande) of gifted children
Ungrouped
The marital status (single, married, divorced) in a sample of 96 individuals reporting high levels of life satisfaction
grouped
The number of symptoms of stress (ranging between 0 and 12 symptoms) experienced by 180 war veterans
Ungrouped
The number of teenagers who have experimented with smoking (yes, no)
Ungrouped
The number of traffic violations ticked during a 3 month period in one of four high-crime communities
Cumulative Percent
The percentage of alcoholics with more than 2 years of substance abuse.
Cumulative Percent
The percentage of athletes training at or below 6 hr. per week.
Relative Percent
The percentage of men in one six physically demanding occupations.
Relative Percent
The percentage of women completing 1, 2, 3, 0r 4 tasks simultaneously
Cumulative Relative Frequency
The proportion of Americans earning $30,000 at most
Cumulative Relevant Frequency
The proportion of elderly patients consuming at or above 1,400 calories per day.
Relative Frequency
The proportion of pregnancies performed in public or private hospitals
5 20
The recommended number of intervals that should be included in a simple frequency distribution is between ___ and ____.
Interval
discrete range of values within which the frequency of a subset of scores is contained
Real Range
is one more than the difference between the largest and smallest value in a list of data
Frequency distribution
is summary display for a distribution of data organized or summarized in terms of how often (or frequently) scores occur
Interval Width
is the range of scores in each interval -divide the real range by number of intervals chosen -round up quotient to the nearest whole number
Sector
represents the relative percent of a particular category
Grouped Data
set of scores distributed into intervals, where the frequency of each score can fall into any one interval
Frequency Polygons
summarizes the frequency of continuous data at the midpoint of each interval (dot-and-line) -midpoint is calculated by adding upper and lower boundary of interval , then dividing by 2
Histograms
summarizes the frequency of continuous data that are grouped
Pie Chart
summarizes the relative percent of discrete and categorical data into sectors
1.00
Cumulative relative frequencies sum to ___ (give or take rounding error)
frequency polygon ogive
A ____ is a dot-and-line graph plotted at the midpoint of each interval, whereas an _____ is a dot-and-line graph plotted at the upper boundary of each interval
Cumulative frequency Distribution
A ____ is a summary display that distributes the sum of frequencies across a series of intervals.
false
A relative percent sums to the total frequency count. true or false
True
A researcher observes that a single parent works 42.25 hours per week. The degree of accuracy of 42.25 is the hundredths place (.01) true or false
c.) Each rectangle represents the frequency of all scores in a distribution.
All of the following are rules for constructing histograms except: a.) A vertical rectangle represents each interval, and the height of the rectangle equals the frequency recorded for each interval. b.) The base of each rectangle begins and ends at the upper and lower boundaries of each interval. c.) Each rectangle represents the frequency of all scores in a distribution. d.) Each rectangle touches adjacent rectangles at the boundaries of each interval.
Down Up
Cumulative frequencies can be added from the top ___ or from the bottom ___.
true
Cumulative relative frequencies are added from the top down or the bottom up true of false
d.) All the above
When cumulating frequencies from the bottom up, you typically want to discuss the data in terms of: a.) at most b.) less than c.) at or below d.) all of the above
b.)"at or above"
When cumulating frequencies from the top down, you typically want to discuss the data in terms of: a.) "less than" b.) "at or above" c.) "at most" d.) "all the above"
True
Whether you cumulate a frequency distribution from the bottom up or the top down depends on how you want to discuss the data true or false
Bar Chart
____ are graphical displays similar to histograms, except that the vertical bars or rectangles do not touch
Ungrouped Data
a set of scores or categories distributed individually, where the frequency for each individual score or category is counted
Frequency Distribution
a summary display for a distribution of data
Frequency
describes the number of times or how often a category, score, or range of scores occurs
ungrouped
the number of single mothers with 1, 2, 3, or 4, children.
1.0
the sum of relative frequencies across all intervals is equal to ___
grouped
the time (in seconds) it takes 100 children to complete a cognitive skills game
