By Michele Shuster, Janet Vigna, Gunjan Sinha
From the groundbreaking partnership of W. H. Freeman and clinical American comes this one of a kind creation to the technology of biology and its impression at the method we are living. Biology for a altering international explores the center principles of biology via a sequence of chapters written and illustrated within the variety of a systematic American article.
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In a controlled experiment, which group receives the placebo? a. the experimental group b. the control group c. the scientist group d. the independent group e. all groups 5. In the studies of coffee and memory discussed, the independent variable was __________ and the dependent variable was _______________. a. caffeinated coffee; decaffeinated coffee b. memory; caffeinated coffee c. caffeine; memory d. memory; caffeine e. decaffeinated coffee; caffeinated coffee j USE IT 6. You are working on an experiment to test the effect of a specific drug on reducing the risk of breast cancer in postmenopausal women.
2. j KNOW IT 1. When scientists carry out an experiment, they are testing a a. theory. b. question. c. hypothesis. d. control. e. variable. 2. Of the following, which is the earliest step in the scientific process? a. generate a hypothesis b. analyze data c. conduct an experiment d. draw a conclusion e. ask a question about an observation j USE IT 3. When a scientist reads a scientific article in a scientific or medical journal, he or she is confident that the report has been peer reviewed. What does this mean?
That’s not a very big study. Could the results have simply been due to chance? What if the 20 people who drank caffeinated coffee just happened to have better memory? One thing that can strengthen our confidence in the results of a scientific study is sample size. 3 Anatomy of an Experiment There are many ways to approach a scientific problem. Controlled experiments are one way. As illustrated here, controlled experiments have two groups: the control group and the experimental group, which differ only in the independent variable.
