What Is A Good Representative Sample Size. For a 95 confidence level which means that there is only a 5 chance of your sample results differing from the true population average a good estimate of the margin of error or confidence interval is given by 1 N where N is the number of participants or sample size Niles 2006. This is the plus-or-minus figure usually reported in newspaper or television opinion poll results.
If your population is less than 100 then you really need to survey all of them. If your population is split 5050 on gender then so should your sample. Jun 16 2017 The smaller the percentage the larger your sample size will need to be.
If your population is split 5050 on gender then so should your sample.
Finally keep in mind that its unlikely that every sample will be perfectly similar to population of interest. Jul 15 2010 For example if youre asking respondents to rate how satisfied they are with a service on a 7-point scale and want no more than a 5 margin of error then youll need to plan on obtaining 249 responses. If your population is less than 100 then you really need to survey all of them. What matters is getting a good representative sample of your population.
