Statistics

Front

What is the Inter-Quartile Range (IQR)?

Back

The IQR is a measure of statistical dispersion, representing the range between the first quartile (Q1) and the third quartile (Q3) in a data set. It is calculated as IQR = Q3 - Q1.

Front

How do you calculate the RANGE of a data set?

Back

The RANGE is calculated by subtracting the smallest value in the data set from the largest value. RANGE = Maximum value - Minimum value.

Front

What is the formula for calculating the standard deviation?

Back

Standard deviation (σ) is calculated using the formula: σ = √(Σ(xi - μ)² / N), where μ is the mean, xi represents each value, and N is the number of values.

Front

What does the mean represent in a data set?

Back

The mean is the average of a data set, calculated by adding all the values together and dividing by the number of values.

Front

What is a quartile in statistics?

Back

A quartile is a type of quantile that divides a ranked data set into four equal parts. The first quartile (Q1) is the median of the lower half, the second quartile (Q2) is the median, and the third quartile (Q3) is the median of the upper half.

Front

What is the difference between the median and the mean?

Back

The median is the middle value of a data set when arranged in order, while the mean is the average of all values. The median is less affected by outliers than the mean.

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 for analysis.

Front

How do you find the first quartile (Q1)?

Back

To find Q1, arrange the data in ascending order and locate the median of the lower half of the data set.

Front

What is the third quartile (Q3)?

Back

Q3 is the median of the upper half of a data set, representing the value below which 75% of the data falls.

Front

What is an outlier in a data set?

Back

An outlier is a data point that significantly differs from other observations in a data set, often due to variability or measurement error.