Has the principle of comparison been addressed in this experimental design?
Which of the following is a true statement about the design of this experiment?
Which of the following accurately describes the benefit of comparison in the experiment shown in the design web?
A biology student wanted to determine if using fertilizer would promote plant growth. The student randomly selected 20 plants and randomly assigned 10 of them to a large square container and the other 10 to a different large square container. Both containers had the same amount of soil and received the same amount of water and light. One container also received fertilizer and the other container did not. Is this a valid experimental design?
A biology student wanted to determine if using fertilizer would promote plant growth. One hundred plants were randomly assigned to one of two groups: one that received fertilizer, and one that did not receive fertilizer. Which of the following statements is true about the benefits of random assignment?
A farmer learns of a new type of corn that is supposed to have a higher yield of ears. From previous crops, he knows approximately how many ears of corn 10 plants will produce from the original seeds. The farmer decides to plant the new type of corn to determine if the seeds will produce a higher number of ears of corn. He plants the first 100 seeds of the new type of corn seeds in the field he uses for corn. When it is time to harvest, he randomly selects 10 plants and counts the number of ears. The farmer compares the number of ears with the yield he received the previous year from 10 plants using the original corn seeds. Because the new type of corn produced a higher number of ears, he concludes that the new type of corn does produce more ears of corn. Which of the following statements is not true about this experimental design?
A doctor wants to determine if a new medication for cholesterol is more effective than the previous medication. The doctor informs patients of a new medication and asks if they want to participate; 30 patients who are currently taking medication for cholesterol volunteer to be part of the study. She uses random assignment of the 30 patients to two treatment groups: one that uses the new medication, and one that uses the original medication. Which of the following describes the benefit of random assignment?
A teacher wanted to determine the effectiveness of two different learning tools — a computer program or a hands-on approach — for a particular concept she was preparing to teach. She will assign her students to one of the two methods to spend the whole class time to learn this concept. Which of the following variables would be moderated due to random assignment?
A biology student wanted to determine if using fertilizer would promote plant growth. One hundred plants were randomly assigned to one of two groups: one that used the fertilizer, and one that did not use a fertilizer. Which of the following is a benefit of having replication in the experiment?
A therapist is studying the effects of meditation and yoga on reducing stress. He offers the treatments to a random sample of 30 of his patients and lets them choose which treatment they want to use. Which of the following statements is not true about this experiment?
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