Data & Statistics Unit Test Review

Front

What is the interquartile range (IQR)?

Back

The interquartile range (IQR) is a measure of statistical dispersion, representing the range of the middle 50% of a dataset. It is calculated as the difference between the third quartile (Q3) and the first quartile (Q1).

Front

What percent of the data is at least 40?

Back

To find the percentage of data points that are at least 40, count the number of values that are 40 or higher and divide by the total number of values, then multiply by 100.

Front

What is the range in a dataset?

Back

The range is the difference between the highest and lowest values in a dataset. It shows how spread out the values are.

Front

What percentage of the data is between 90 and 140?

Back

To find the percentage of data between two values, count the number of values that fall within that range, divide by the total number of values, and multiply by 100.

Front

What does 'mean' 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

What is a dataset?

Back

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

Front

What is a quartile?

Back

A quartile is a type of quantile that divides a dataset 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 dataset, representing the 25th percentile.

Front

What is the third quartile (Q3)?

Back

The third quartile (Q3) is the median of the upper half of a dataset, representing the 75th percentile.

Front

How do you calculate the median?

Back

To calculate the median, arrange the data in order and find the middle value. If there is an even number of values, average the two middle values.