A researcher wishes to ?estimate, with ?99% confidence, the population proportion of adults who are confident with their?country's banking system. His estimate must be accurate within ?4% of the population proportion.
No preliminary estimate is available. Find the minimum sample size needed.
Find the minimum sample size? needed, using a prior study that found that ?36% of the respondents said they are confident with their ?country's banking system.
?Compare the results from parts (a) and (b)
?What can you conclude about the minimum sample size needed when you have an estimate and when you do? not?
In a survey of 702 males ages? 18-64, 435 say they have gone to the dentist in the past year.
Complete the following.
a. Find Modifying Above p with caret ^p
The point estimate for p. ?(Round to two decimal places as?needed.)
b. Construct a? 90% confidence interval for the population proportion.
c. Construct a ?95% confidence interval for the population proportion.