Statistics Pre-test

Front

What is 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 interquartile range (IQR)?

Back

The IQR is calculated by subtracting the first quartile (Q1) from the third quartile (Q3) of a data set.

Front

What is the mean of a data set?

Back

The mean is the average of all the values in a data set, calculated by dividing the sum of the values by the number of values.

Front

What is the median of a data set?

Back

The median is the middle value when the data set is ordered from least to greatest. If there is an even number of values, the median is the average of the two middle values.

Front

What is the mode of a data set?

Back

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

Front

What is an outlier?

Back

An outlier is a value that is much less or much greater than the other values in a data set.

Front

What is the difference between the mean and median?

Back

The mean is affected by outliers, while the median is not, making the median a better measure of central tendency for skewed data.

Front

What does it mean if a data set is skewed?

Back

A skewed data set has a distribution that is not symmetrical, with values concentrated on one side.

Front

What is a quartile?

Back

A quartile is a type of quantile that divides a data set into four equal parts.

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.