Question: A recent Harris survey of 1961 adults showed that 76% have registered for the “Do Not Call” registry, so that telemarketers do not phone them.
Analyzing the Data:
Completely answer questions 1 - 5.
1. Use the survey results to construct a 95% confidence interval estimate of the percentage of all adults on the “Do Not Call” registry.
2. Identify the margin of error for this survey. Edit
Answer: 1. p=0.76,n =1961
z_c= 1.96 at 95% confidence.
margin of error, E = sqrt(pq/n)*z_c
95% CI = (p -E, p+E)
= (0.76-0.0189 ,0.76+0.0189 )
= (0.7411, 0.7789) (Ans.) Edit
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