Exercise Attitudes and Behaviors: A Survey of Adults Age 50-79 - Aarp

Sampling error
Introduction and Method Overview
All samples are subject to some degree of sampling “error”—that is,
statistical results obtained from a sample can be expected to differ
somewhat from results that would be obtained if every member of the
target population were interviewed. In this report, the maximum margin of
error at a 95% confidence level is within +/- 3 percentage points for base
sizes of 1,000. Subsample margins of error will be higher.
Weighting
Completed interviews were weighted by age, sex, education, and region to
ensure reliable and accurate representation of the target population.
Percentages not totaling 100%
For tabulation purposes, percentage points are rounded off to the nearest
whole number. As a result, percentages in a given table column may total
slightly higher or lower than 100%.
In questions that permit multiple responses, columns may total
significantly more than 100%, depending on the number of different
responses offered by each respondent. Similarly, when only selected
responses are shown, percentages may total less than 100%.
Asterisks (*) are used when percentages fall below 0.5%. A dash (-)
indicates 0%.
Multivariate segmentation
In order to determine whether or not Americans 50-79 group themselves
according to shared attitudes about exercise and fitness, RoperASW
statisticians conducted a multivariate segmentation (K-Means) of
respondents into six groups based on their level of physical activity and
attitudes toward exercise and fitness (Qs. 7, 5a, 13, 14 from the first
wave). Results are discussed in Chapter VII.
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