Statistics Practice 2

Which of the following statements corresponds to a frequency distribution?

• a table that shows the number of times a data entry appears in a data set.

• a data set that shows the number of data entries that appear in a time.

• a conclusion drawn from a sample.

• the boundaries between two consecutive bars.

Observe the frequency distribution:

What is the midpoint of the first class?

• 4

• 5

• 1

• 3

To construct a histogram, we have to estimate ________ or _______ to label the horizontal axis.

• midpoints - class boundaries

• lower class limits - upper class limits

• frequencies - data entries

• colours - numbers

Which interval has 400 employees?

• 33-43
• 0-10
• 77-87
• 66-76

Is a histogram the same as a bar graph?

• Yes, because they both use intervals.
• No, because a histogram displays numerical data while a bar graph displays categorical data.
• Yes, because they both use bars to display data.
• No, because a histogram displays categorical data while a bar graph displays numerical data.

How many employees have a salary less than $22,000?

• 50
• 350
• 0
• 10

The horizontal axis of a frequency polygon comes from this column:

• Class width

• Frequency

• Midpoint

• Class Endpoints

• Class Boundaries

The vertical axis of a frequency polygon comes from this column:

• class width

• frequency

• class midpoint

• class boundaries

What is the midpoint of the class 7-11 ?

• 9.5

• 9

• 4

• 2

Which of the following is the correct frequency polygon for the data given?

• 
• 
• 
•