Question 330927: Help me solve this question please.
A researcher wishes to estimate,with 90% confidence, the proportion of adults who have high speed internet access.Her estimate must be accurate within 3% of the true proportion.a)Find the minimun sample neede, using a prior study that found that 48% of the respondents said they have high speed internet access.n=?
b)no preliminary estimate is available.Find the minimum sample size needed.n=?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Help me solve this question please.
A researcher wishes to estimate,with 90% confidence, the proportion of adults who have high speed internet access.Her estimate must be accurate within 3% of the true proportion.
a)Find the minimum sample needed, using a prior study that found that 48% of the respondents said they have high speed internet access.
n=[1.645/0.03]^(0.48)(0.52) = 750.47
n = 751 when rounded up
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b) No preliminary estimate is available.Find the minimum sample size needed.
n = [1.645/0.03]^2(1/2)(1/2) = 751.67
n = 752 when rounded up
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Cheers,
Stan H.
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