# Thread: Sample Size Calculator (one group versus population)

1. ## Sample Size Calculator (one group versus population)

Dear all,

so far I couldn´t find a solution to calculate the required sample size for the following scenario:

Goal: Research continuous variables (cost perceptions) of a population through one sample group. --> means of one group need to be significant for the entire population.

Population: 7.500.000
Confidence Level: 95%
Confidence Interval: 3

Are there any information missing like power level and does anyone know how I can calculate the required sample size for this scenario? Especially through an online tool would be highly appreciated.

Thanks very much.

Chris

2. ## Re: Sample Size Calculator (one group versus population)

It sounds like you are asking for the sample size needed to get a 95% confidence interval for a population mean (calculated from from one sample) to be +/- 1.5 but it isn't clear to me. If so the missing information is the SD of the data.
Can you explain a little more please? kat

3. ## Re: Sample Size Calculator (one group versus population)

Originally Posted by Conjoint Chirs
Goal: Research continuous variables (cost perceptions) of a population through one sample group.
Would you tell us more about your variables? What exactly is "cost perceptions"? This doesn't sound like a continuous variable, but your explanation would help clarify that.

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