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1. A researcher wishes to estimate, with 95% confidence, the percentage of adults who support abolishing the penny. His estimate must be accurate within 5% of the true proportion. Find the minimum sample size needed, using a prior study that found that 34% of the respondents said they support abolishing the penny. Round to the nearest whole number as needed. n=? What is the minimum sample size needed assuming that no prior information is available? n=?
2. find the indicated probability using the standard normal distribution. 3. find the margin of error for the given values of c,s, and n 4. find the critical value of Tc for the confidence level c=0.95 and sample size n=29 5. find the margin of error for the given values of c,s, and n
p(-3.04
c=0.90, s=3.5, n=29
Tc=
c=0.90, s=2.8, n=81
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