# Sample size: Penny abolition

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)

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Statistics

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. ...

#### Solution Summary

The solution provides step by step method for the calculation of sample size. Formula for the calculation and Interpretations of the results are also included.