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Sagot :
The sample size is 289.
Zα/2 = [tex]Z_{0.025}[/tex]
= 1.96
Sample size = n
n = [Zα/2* σ / E] 2
n = [1.96 * 26 / 3 ]2
n = 288.54
n = 289.
In records, the pattern size is the measure of the number of man or woman samples used in an experiment. As an example, if we are testing 50 samples of folks that watch tv in a town, then the sample length is 50.
An awesome sample length is normally 10% as long because it no longer exceeds a thousand. A very good sample length is commonly around 10% of the populace, as long as this doesn't exceed one thousand. for example, in a populace of 5000, 10% could be 500. In a populace of 200,000, 10% would be 20,000.
Learn more about the sample size here https://brainly.com/question/25574075
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