What is the formula for calculating the variance for ungrouped data
To calculate the variance for ungrouped data, you can use the following formula:
Variance = (Σ(x - μ)²) / n
Where:
- Σ denotes the summation of all the values
- x represents each individual data point
- μ denotes the mean or average of the data set
- n represents the total number of data points in the set
To use the formula, follow these steps:
1. Find the mean (average) of the data set.
2. For each value in the set, subtract the mean from that value, and square the result.
3. Add up all the squared differences.
4. Divide the sum of the squared differences by the total number of data points to obtain the variance.