Lesson 9.1- Measures of Center and Spread

Front

What is the mean?

Back

The mean is the average of a set of numbers, calculated by adding all the numbers together and dividing by the count of numbers.

Front

How do you find the median?

Back

To find the median, arrange the numbers in ascending order and identify the middle number. If there is an even number of observations, the median is the average of the two middle numbers.

Front

What is the mode?

Back

The mode is the number that appears most frequently in a data set.

Front

Define interquartile range (IQR).

Back

The interquartile range (IQR) is the difference between the first quartile (Q1) and the third quartile (Q3) in a data set, representing the range of the middle 50% of the data.

Front

How do you calculate the IQR?

Back

To calculate the IQR, first find Q1 (the median of the lower half of the data) and Q3 (the median of the upper half of the data), then subtract Q1 from Q3.

Front

What is a data set?

Back

A data set is a collection of related data points or values, often organized in a table or list.

Front

What does it mean to find the range of a data set?

Back

The range is the difference between the highest and lowest values in a data set.

Front

How do you calculate the mean of a data set?

Back

To calculate the mean, sum all the values in the data set and divide by the total number of values.

Front

What is a quartile?

Back

A quartile is a type of quantile that divides a data set into four equal parts, with each part containing 25% of the data.

Front

What is the first quartile (Q1)?

Back

The first quartile (Q1) is the median of the lower half of a data set, representing the 25th percentile.