By Colleen Belk, Virginia Borden Maier
The 3rd variation of Biology: technology for all times maintains to attract scholars into biology via attractive tales that make tough subject matters extra obtainable and comprehensible. Colleen Belk and Virginia Borden try to make educating and studying biology a greater adventure from either side of the table. The authors draw from their instructing stories to create a textual content with a flowing narrative and cutting edge good points that require scholars to turn into extra energetic individuals of their studying. every one bankruptcy offers the fabric via a narrative that attracts from actual existence examples, making the studying extra attractive and available to present day scholars. those tales attempt to demystify themes present in biology. The 3rd version of this ebook contains a thoroughly re-designed paintings software and makes use of the authors' instructing reviews to create student-centered good points similar to the hot Savvy Reader, Visualize This, and forestall and Stretch to encourage and inspire pupil studying. the hot a more in-depth glance permits teachers the chance to extend on convinced vital organic subject matters. For teachers who want to conceal Animal constitution and serve as and Plant Biology, an alternative version of this ebook, Biology: technological know-how for all times with body structure, is usually to be had.
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Additional info for Biology: Science for Life
In the experiment with the echinacea tea, statistical tests tell us the likelihood that the 33% reduction in cold severity observed by the researchers is an accurate measure of how well echinacea tea works, versus the likelihood that the 33% reduction resulted from chance differences between the experimental and control groups. Statistical Significance. We can explore the role that statistical tests play by evaluating a study on another proposed treatment to reduce the severity of colds—lozenges containing zinc.
Instead, people who take vitamin C supplements experience fewer colds than people who do not supplement because they are more likely to exercise, and it is exercise that reduces cold susceptibility. A hypothesis that seems to be true because it has not been rejected by an initial test may be rejected later based on the results of a different test. As a matter of fact, this is the case for the hypothesis that vitamin C consumption reduces susceptibility to colds. The argument for the power of vitamin C was popularized in 1970 by Nobel Prize-winning chemist Linus Pauling in his book, Vitamin C and the Common Cold.
One effective way of eliminating differences between groups is the random assignment of individuals to experimental and control groups. For example, a researcher might put all of the volunteers' names in a hat, draw out half, and designate these people as the experimental group and the remainder as the control group. As a result, there is unlikely to be a systematic difference between the experimental and control groups—each group should be a rough cross section of the population in the study. In the echinacea tea experiment just described, members of both the experimental and control groups were female employees of a nursing home who sought relief from their colds at their employer's clinic.