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    Sample size: Penny abolition

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    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.

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