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15 is the standard error of the mean .
What is standard error?
- The population mean and sample mean are likely to deviate from one another, and the standard error of the mean, or simply standard error, shows how likely this is.
- If a study were to be repeated using fresh samples drawn from a single population, it would be possible to calculate how much the sample mean would change.
- In statistics, the term "standard error" refers to a quantitative measure of variability.
- It allows for the determination of the standard deviation of a certain sample.
- It is frequently referred to by its shortened form, SE. The effectiveness, accuracy, and consistency of a sample are estimated using standard error.
Standard error = σ/√n = 120/√64 = 120/8 = 15
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