Solution :
Given that,
(a)
= 0.54
1 - = 1 - 0.54 = 0.46
margin of error = E = 0.04
Z/2 = 2.576
sample size = n = (Z / 2 / E )2 * * (1 - )
= (2.576 / 0.04)2 * 0.54 * 0.46
= 1030
sample size = n = 1030
(b)
= 1 - = 0.5
margin of error = E = 0.04
Z/2 = 2.576
sample size = n = (Z / 2 / E )2 * * (1 - )
= (2.576 / 0.04)2 * 0.5 * 0.5
= 1037
sample size = n = 1037
A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size...
A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size sample should be obtained if she wishes the estimate to be within 0.03 with 90% confidence if (a) she uses a previous estimate of 0.54? (b) she does not use any prior estimates? Click the icon to view the table of critical values. (a) n=(Round up to the nearest integer.)
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A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size sample should be obtained if she wishes the estimate to be within 0.05 with 99% confidence if (a) she uses a previous estimate of 0.58? (b) she does not use any prior estimates? (Round up to the nearest integer).
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