Scientific Knowledge — Unit test Answers

Which of these terms describe the data? Check all that apply.

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Why is repetition important?

In studies about new medicines, researchers usually give one group of patients the medicine that is designed to treat an illness. They give another group of patients a placebo, which is taken the same way as the medicine but does not actually contain the ingredients of any medicine. Different medicines are tested in different experiments, but the placebos usually contain the same non-medical ingredients. If both groups of patients are healed, then researchers cannot be sure whether the medicine caused improvement, but if the group given the medicine is healed while the group given the placebo remains ill, researchers can conclude that the medicine causes the illness to go away.

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A food company has designed new types of breakfast cereal and is now working to decide which cereal to mass produce and begin selling. They can measure some traits of the cereals with scientific tools, but they also use small surveys to ask cereal buyers about their opinions.Which question could most likely be answered scientifically by the food company?

The three main types of scientific investigations are descriptive, comparative, and experimental. Which components are included in all three types of investigations?a scientific questionan independent variablea dependent variablea procedurea control groupa conclusion

Oil is a powerful source of energy used for cars, machines, and many other purposes. While studying sources of energy that could replace the use of oil, a student thinks about solar power, wind power, nuclear power, and electric batteries. The students asks,"Which type of source will waste the least energy and provide the most energy in all situations?"Which best describes why a scientist would ask a different question than this one?

Louis Pasteur likely worked with a hypothesis similar to this one:"If liquids are heated to a certain temperature and germs die, then the liquids will be less likely to cause sickness when consumed, because reducing germs is a way to prevent disease.”