Assignment:
A researcher wishes to estimate, with 90% confidence, the percentage of adults who support abolishing the penny. His estimate must be accurate within 2% of the true proportion.
a) Find the minimum sample size needed, using a prior study that found that 24% of the respondents said they support abolishing the penny.
b) No preliminary estimate is available. Find the minimum sample size needed.
A)What is the minimum sample size needed, using a prior study that found that 24% of the respondents said they support abolishing the penny?
n= _______ (round up to the nearest whole number as needed).
B)What is the minimum sample size needed assuming that no prior information is available?
n= _____ (round up to the nearest whole number as needed)
Provide complete and step by step solution for the question and show calculations and use formulas.