When to use the sample or population standard deviation We are normally

When to use the sample or population standard

This preview shows page 1 - 3 out of 4 pages.

When to use the sample or population standard deviation We are normally interested in knowing the population standard deviation because our population contains all the values we are interested in. Therefore, you would normally calculate the population standard deviation if: (1) you have the entire population or (2) you have a sample of a larger population, but you are only interested in this sample and do not wish to generalize your findings to the population. However, in statistics, we are usually presented with a sample from which we wish to estimate (generalize to) a population, and the standard deviation is no exception to this. Therefore, if all you have is a sample, but you wish to make a statement about the population standard deviation from which the sample is drawn, you need to use the sample standard deviation. Confusion can
Image of page 1
often arise as to which standard deviation to use due to the name "sample" standard deviation incorrectly being interpreted as meaning the standard deviation of the sample itself and not the estimate of the population standard deviation based on the sample. How to calculate grouped data standard deviation? Step by step calculation: Step 1: find the mid-point for each group or range of the frequency table.
Image of page 2
Image of page 3

You've reached the end of your free preview.

Want to read all 4 pages?

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture