Answer to Question #234374 in Statistics and Probability for Bips

Question

How to calculate sample size without random variables

Answer 1

Steps to find sample size

1. Find the population size

2 Calculate the margin error or confidence interval which is calculated in terms of mean numbers

3. Find the confidence level this deals with how confident one wants to be that the actual means falls within the margin error

4. Standard deviation this step asks to estimate how much the responses one receive vary from each other and from the mean number

5. Find the Z- score a Z score is the numerical representation of desired confidence level

Z=(x- μ) /δ

6. Sample size= ((Z-score)² * Std Dev *(1- Std Dev))/(margin of error)²

Std Dev stands for standard deviation