Kay Kinton, a spokeswoman for AWS, says the company commissioned independent research from IDC that examined a small sample of AWS customers and found that four-fifths said their unplanned downtime dropped after they moved operations to the cloud.

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The National Federation of Independent Business (NFIB) conducts monthly surveys of a random sample of its 350, 000 members.

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Obama gains 13 points among pro-choice independent women -- who make up 9 percent of the sample -- and 9 points among pro-choice Republican women, who account for 5 percent of the sample, according to the poll.

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The reliance on self-reporting weight, height, activity, and soda consumption in some studies rather than independent measuring and verification might confound their reliability, as might small sample sizes.

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