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Survey Methodology. Semi-annual 401(k) participant survey conducted by the Principal Financial Group14,200 emails containing survey links were emailed to active participants with account balances greater than $5,000 in April 2010675 surveys were returned for a response rate of 4.8% Margin of erro
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1. Principal Financial GroupŽ Retirement & Investor Services401(k) Participant Survey ResultsSpring 2010