Q12- A researcher wishes to estimate, with 99% confidence, the population proportion of adults who a

Q12- 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 3% of the population proportion.(a) No preliminary estimate is available. Find the minimum sample size needed.b) Find the minimum sample size needed, using a prior study that found that 26%C)compare the results from parts (a) and (b)————————————————-Q13- A researcher wishes to estimate, with 95% confidence, the population proportion of adults who say chocolate is their favorite ice cream flavor. Her estimate must be accurate within 3% of the population proportion.(a) No preliminary estimate is available. Find the minimum sample size needed.(b) Find the minimum sample size needed, using a prior study that found that 18% of the respondents said their favorite flavor of ice cream is chocolate.(c) Compare the results from parts (a) and (b).