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20 questions
This is the interval between two consecutive upper (or lower) class limits.
class width
class boundaries
midpoints
frequency
These are used as the border between two consecutive bars in a histogram. They are the intermediate value between an upper class limit and the next lower class limit.
class limits
class boundaries
frequencies
class marks
Why is this frequency distribution incorrect?
The fourth class width is different from the others
There is a zero.
Classes should overlapped.
Find the midpoints.
25.5, 35.5, 45.5, 55.5, 65.5, 75.5
20.5, 30.5, 40.5, 50.5, 60.5, 70.5, 80.5
21, 31, 41, 51, 61, 71
30, 40, 50, 60, 70, 80
Find the relative frequencies
37%, 76%, 92%, 95%, 98%, 100%
28%, 30%, 12%, 2%, 2%, 2%
33%, 37%, 20%, 7%, 7%, 7%
37%, 39%, 16%, 3%, 3%, 3%
Find the cumulative frequencies.
28, 56, 84, 100
28, 58, 70, 72, 74, 76
33%, 37%, 20%, 7%, 7%, 7%
28, 30, 12, 2, 2, 2
Look at the frequency distribution. Find the class boundaries.
21, 31, 41, 51, 61, 70, 80
25.5, 35.5, 45.5, 55.5, 65.5, 75.5
20.5, 30.5, 40.5, 50.5, 60.5, 70.5
30, 40, 50, 60, 70, 80
Complete the definition:
class boundaries
lower class limits
upper lass limits
midpoints
Which of the following is the correct formula to find class width?
(max-min)/(# of classes), round up to the next integer
(max-min)/2, round up to the next integer
(max-min)/(# of classes), round normally
(max+min)/2, round normally
(max-min)/(number of data), round up to the next integer
What would be the cumulative frequency for the third class?
5
12
17
18
This is an ogive.
true
false
What is another name for the ogive?
Histogram
Frequency Polygon
Cumulative frequency graph
Pareto chart
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