Introduction to Statistics Quiz

What is the primary focus of descriptive statistics?

• To create new data

• To make predictions about data

• To describe data with a smaller set of numbers

• To find the cause of data patterns

If you have a set of plant heights, what might you want to find to represent all the heights?

• A typical or middle number

• The shortest plant

• The color of the plants

• The tallest plant

What does arithmetic mean?

• The most frequent number in a data set

• The largest number in a data set

• The sum of all numbers divided by the number of numbers

• The middle number in a data set

How do you calculate the arithmetic mean of the numbers 4, 3, 1, 6, 1, and 7?

• Add all the numbers and divide by 5

• Add all the numbers and divide by 6

• Subtract the smallest number from the largest

• Multiply all the numbers and divide by 6

What is the median?

• The most frequent number in a data set

• The smallest number in a data set

• The sum of all numbers divided by the number of numbers

• The middle number in an ordered data set

If you have an even number of data points, how do you find the median?

• Choose the smallest number

• Choose the largest number

• Take the average of the two middle numbers

• Add all the numbers and divide by the total count

What is the median of the data set 0, 7, 50, 10,000, and 1 million?

• 50

• 10,000

• 7

• 0

What is the mode in a data set?

• The sum of all numbers divided by the number of numbers

• The middle number in an ordered data set

• The most common number in a data set

• The smallest number in a data set

In the data set 4, 3, 1, 6, 1, and 7, what is the mode?

• 6

• 1

• 3

• 4

Which measure of central tendency is most useful when you have a number that appears much more frequently than others?

• Median

• Arithmetic mean

• Range

• Mode