# 2106 Univariate Data - Creating Intervals

12 Questions | Total Attempts: 670  Settings  How do you create an interval? How do you know how wide it should be, and how many intervals to create?

• 1.
What is the ideal number of intervals for a set of data?
• A.

Less than 5

• B.

More than 20

• C.

12

• D.

Between 5 and 15

• E.

Less than 7

• F.

I don't know

• 2.
The number of intervals we choose for a data set is 'arbitrary'. What does this mean?
• A.

Exact

• B.

Small

• C.

Randomly chosen

• D.

Chosen by a formula

• E.

Designed to confuse

• F.

I don't know

• 3.
The interval width we choose is designed to :
• A.

Show all the data

• B.

Show a pattern in the data

• C.

Display the data laterally

• D.

Show the range more easily

• E.

• F.

I don't know

• 4.
I have data from 200 people regarding their resting heart rates - from 47 beats per minute to 108 beats per minute. If I decide to make the intervals 10 wide, how many intervals would I have?
• 5.
I have data from 200 people regarding their resting heart rates - from 67 beats per minute to 108 beats per minute. If I decide to make the intervals 10 wide, how many intervals would I have?
• 6.
What is the width of the interval class shown in the histogram above
• 7.
The histogram below displays a set of data in interval classes. The first class goes from 76-77.9, the second from 78-79.9 etc.What is the modal class interval?
• 8.
What is the width of the interval class shown in the histogram above?
• 9.
What is the frequency of the modal interval?
• 10.
How many interval classes are in the histogram above?
• 11.
What is the frequency of the modal interval in the histogram above?
• 12.
The histogram below shows data displayed in interval classes from 65-69.9, 70-74.9 etc.What is the frequency of the 95-99.9 interval class?
• 13.
What is the frequency of the modal interval in the histogram above?
• 14.
The histogram below displays data in class intervals from 165-169.9, 170-174.9 etc.What is the modal interval in the histogram above?
• 15.
The histogram below displays data in class intervals from 165-169.9, 170-174.9 etc.What is the frequency of the interval 195-199.9 in the histogram above?
• 16.