The aim of this investigation was to assess how changes in study design concerning the number of replicates, the number of samples, and/or the number of individuals, as well as changes in the [SD.sub.A] of the instruments used, influence the width of the CI of the estimated SDWP and thereby the reliability of the estimate.
In Table 2 the skewness values of the [CI.sub.95] for the SDWP are shown for the same designs as in Table 1.
The width and skewness of the [CI.sub.95] for the estimate of the SDWP are not affected by the ratio between the [SD.sub.BP] and the [SD.sub.WP] (results not shown).
The results show that a low [SD.sub.A] in comparison to the SDWP is vital to gain sufficient power in the experiment.
The 2 CI values are not overlapping, indicating a significant difference in the SDWP for the 2 periods.
The power of a study design intended to estimate the SDWP is very much dependent on the [SD.sub.A].
The Respondents Orientation will be held at the SDWP
office, located at 3910 University Avenue, San Diego, CA 92105, in the Julie Benedict Community Room (third floor).