a researcher wishes to estimate the proportion of adults who have high spped internet access . what size sample should be obtained if she wishes the estimate to be within 0.05 with 90% confidence if she uses a previous estimate of 0.46
Solution:
Sample size formula is given as below:
n = p*q*(Z/E)^2
We are given
p = 0.46
q = 1 – p = 1 – 0.46 = 0.54
Confidence level = 90%
Critical Z value = 1.6449
(by using z-table)
E = 0.05
n = 0.46*0.54*(1.6449/0.05)^2
n = 268.838
Required sample size = 269
a researcher wishes to estimate the proportion of adults who have high spped internet access ....
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