Sample Statistic

Five types of sample statistics include sample mean, sample variance, sample standard deviation, sample proportion.

1. Sample mean is the average of all data points in a sample. It is calculated by summing all values in sample and then dividing by number of observations.
2. The sample variance measures the dispersion and spread of data points in sample. It indicates the average of squared differences from sample mean.
3. Sample standard deviation is the square root of the sample variance that provides a measure of dispersion in same units as data.
4. The sample proportion is fraction of the sample that has a certain attribute or characteristics. This is used for estimating population proportion.
5. Sample median is middle value in an ordered list of sample data. When the sample size is even, the median is the average of two middle numbers.