RESEARCH METHODOLOGY

Detailed explanation-1: -Here’s a quick preview of the steps we’re about to follow: Step 1: Find the mean. Step 2: For each data point, find the square of its distance to the mean. Step 3: Sum the values from Step 2.

Detailed explanation-2: -The variance measures the average degree to which each point differs from the mean. While standard deviation is the square root of the variance, variance is the average of all data points within a group.

Detailed explanation-3: -The larger the sample, the smaller the standard error, and the closer the sample mean approximates the population mean. Do this by dividing the standard deviation by the square root of N, the sample size.

Detailed explanation-4: -Correct answer: The first step in calculating standard deviation, or, is to calculate the mean for your sample, or . Remember, to calculate mean, sum your data values and divide by the count, or number of values you have. Next, we must find the difference between each recorded value and the mean.