# RESEARCH METHODOLOGY

## STATISTICAL TECHNIQUES AND TOOLS

### MEASURES OF CENTER AND SPREAD

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which is the symbol for sample mean?
 A x̄ B C n D
Explanation:

Detailed explanation-1: -The term “x bar” represents the sample mean. The symbol ‘ xi’ used in this formula represents the represents the sum of all scores present in the sample (say, in this case) x1 x2 x3 and so on.

Detailed explanation-2: -The sample mean is a statistic obtained by calculating the arithmetic average of the values of a variable in a sample. If the sample is drawn from probability distributions having a common expected value, then the sample mean is an estimator of that expected value. Definition.

Detailed explanation-3: -The general formula for calculating the sample mean is given by x̄ = ( xi ) / n. Here, x̄ represents the sample mean, xi refers all X sample values and n stands for the number of sample terms in the data set.

There is 1 question to complete.