A researcher wishes to estimate, with 95% confidence, the population proportion of adults who think Congress is doing a good or excellent job. Her estimate must be accurate within 3% of the true 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 20% of the respondents said they think Congress is doing a good or excellent job.(c) Compare the results from parts (a) and (b). (a) What is the minimum sample size needed assuming that no prior information is available? n= (Round up to the nearest whole number as needed.) I dont know how to put this information in my calculator and what each symbol means! Can anyone help? Many thanks!
A researcher wishes to estimate, with
95% confidence, the population proportion of adults who think Congress is doing a good or excellent job. Her estimate must be accurate within
3% of the true proportion.
(a) No preliminary estimate is available. Find the minimum
(b) Find the minimum sample size needed, using a prior study that found that 20% of the respondents said they think Congress is doing a good or excellent job.
(c) Compare the results from parts (a) and (b).
(a) What is the minimum sample size needed assuming that no prior information is available?
n
=
(Round up to the nearest whole number as needed.)
I dont know how to put this information in my calculator and what each symbol means! Can anyone help? Many thanks!
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