Question

Explain what each of symbol represents:

$a)\sum _{}b)nc)\stackrel{-}{x}$

Short answer

$a)\sum _{}-$Summation means the sum of all the observation.

$b)n-$Sample size, means the number of the observations in the sample.

$c)\stackrel{-}{x}-$Sample mean, means the mean of the observations for a sample.

Step-by-step solution

Step 1. Given information. 

Explain what each of symbol represents:

$a)\sum _{}b)nc)\stackrel{-}{x}$

Step 2. Explanation for each symbol.

Summation $\sum _{}$means the sum of all the observation.

Sample size, $n$means the number of the observations in the sample.

Sample mean $\stackrel{-}{x}$means the mean of the observations for a sample.