Sample Size Calculator wth Proportion Percentage, formulas

Sample-Size Calculator
An online sample size calculator with and without finite population corrections.
Sample Size Formula
n = z2 * p * (1 - p) / e2
Where,
z value (e.g. 1.96 for 95% confidence level)
p = proportion (as a decimal),
e = margin of error (%).
Sample Size (with finite Population Correction)
n = [z2 * p * (1 - p) / e2] / [1 + (z2 * p * (1 - p) / e2 * N)]
Where,
z value (e.g. 1.96 for 95% confidence level)
p = proportion (decimal),
N = population size,
e = margin of error.
Detailed Description:Population Size - The total number of people whose opinion or behaviour your sample will represent.
Confidence Level (%) - The Probability that your sample accurately reflects the attitudes of your population.The industry standard is 95%.
Margin of Error (%) - The range (measured as a percentage) that your populations response may deviate from your samples.
z value
Our calculator used the following z-score values.
Confidence Level | z-score |
---|---|
70% | 1.04 |
75% | 1.15 |
80% | 1.28 |
85% | 1.44 |
90% | 1.645 |
91% | 1.7 |
92% | 1.75 |
93% | 1.81 |
94% | 1.88 |
95% | 1.96 |
96% | 2.05 |
97% | 2.17 |
98% | 2.33 |
99% | 2.576 |
99.5% | 2.807 |
99.9% | 3.29 |
99.99% | 3.89 |

How the sample size used in Survey?
Sample Size can be used in different areas in the world and some of them are
1/ Market research and development(R&D)
2/ Customer satisfaction surveys(CSR)
3/ Education surveys(ES)
4/ Employee and human resources surveys(HRS)
5/ Healthcare surveys(HCS)
6/ Casual surveys
See Also ►
Z Score to Percentile Calculator
Percentile,Ordinal Rank Calculator
P Value from Z score Calculator
Letter Arrangment Probability Calculator
PERT Expected Time Probability Calculator
Mean Median Mode Ranges Calculator
