In your opinion, what are the advantages and disadvantages to using self-reports for gathering data on physical activities instead of directly observing the participants’ activities? Explain. The women were asked about their activities over a seven-day period. In your opinion, is this a long enough period of time? Explain. Cancer Risk-Reduction BehaviorsSTATISTICAL GUIDEThe range is the difference between the highest and the lowest scores in a set of scores.(Some statisticians add "1" to the difference.) Sometimes researchers merely report thehighest and lowest values (without subtracting) and refer to the two values as the range.Other times, a single number is reported for the range, and in this case, the single number isthe difference between the highest and lowest score.The range is one indicator of how dispersed or spread out a set of scores is. The range isimportant because it gets at the idea of variation or variability in a distribution-one of thekey features of a distribution. If the range is small, the variation is small and vice versa.Article #2 on Mean and RangeBy the way, the terms variation, spread, and dispersion are often used interchangeably.They all point towards a central idea-the amount of difference in the scores, one fromanother, in a distribution. The range is the most straightforward way to calculate thevariation or spread in a distribution. It is also the most conceptually simple way to thinkabout variation in a distribution. Still, the range as a description of variation has itslimitations, which is why other methods to calculate the variation are needed. The rest of theexercises in Unit II cover many of the further ways to think about and calculate the variationin a distribution.BACKGROUND NOTEThe researchers who reported the information below were studying the physical activity ofwomen who had survived breast cancer. The women in the study self-reported their levelsof physical activity (i.e., their activities were not observed by the researchers).EXCERPT FROM THE RESEARCH ARTICLE¹Table 1Physical Activity (Mean Hours/Day Averaged over 7 Days)Activity LevelSleepLight physical activityModerate physical activityHard physical activityVery hard physical activityM7.358.713.36.78.14Range5.5-8.83.0-16.071-8.30-4.10-1.05NOTE1 Lindsey, A. M., Waltman, N., Gross, G., Ott, C. D., & Twiss, J. (2004). Cancer risk-reductionbehaviors of breast cancer survivors. Western Journal of Nursing Research, 26, 872-890.Reprinted by Permission of SAGE Publications, Inc.

In your opinion, what are the advantages and disadvantages to using self-reports for gathering data on physical activities instead of directly observing the participants’ activities? Explain. The women were asked about their activities over a seven-day period. In your opinion, is this a long enough period of time? Explain.

In your opinion, what are the advantages and disadvantages to using self-reports for gathering data on physical activities instead of directly observing the participants’ activities? Explain. The women were asked about their activities over a seven-day period. In your opinion, is this a long enough period of time? Explain.

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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