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According to the Stern Marketing Group, 9 out of 10 professional women say that financial planning...



According to the Stern Marketing Group, 9 out of 10 professional women say that financial planning is more important today than it was five years ago. Where do these women go for help in financial planning? Forty-seven percent use a financial advisor (broker, tax consultant, financial planner). Twenty-eight percent use written sources such as magazines, books, and newspapers. Suppose these figures were obtained by taking a sample of 640 professional women who said that financial planning is more important today than it was five years ago.

a. Construct a 95% confidence interval for the proportion of professional women who use a financial advisor. Use the percentage given in this problem as the point estimate.
b. Construct a 90% confidence interval for the proportion of professional women who use written sources. Use the percentage given in this problem as the point estimate.



(Round your answers to 4 decimal places.)

a.   ≤ p ≤  
b.   ≤ p ≤  

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