Question

Which describes the standard deviation?

A. a form of measurement of the average difference between sample values and the sample mean
B. the confidence level that a sample mean accurately represents a population mean
C. the value for which half of the sample elements are no bigger, and half are no smaller
D. the interval around the sample mean that you expect to contain the population mean

Answer 1

The correct answer would be A

Answer 2

The correct option is:

Option: A

A. a form of measurement of the average difference between sample values and the sample mean

Explanation:

We know that:

The Standard Deviation is a measure of how spread out numbers are.

It is represented by the symbol sigma 'σ '

It is calculated as:

• Firstly estimating the mean of the data.

• Then calculating the deviation of the data points.
• Squaring the deviations.
• calculating the mean of the above quantities which is also known as variance.
• Taking square root of the variance.

Hence, the correct option is:

Option: A.