Scientific Method Quiz Top of Form Your lab is studying an experimental drug tha

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Scientific Method Quiz

Top of Form

Your lab is studying an experimental drug that may be able to prevent obesity. You are testing the drug on rats for a preliminary analysis. You have chosen four groups of rats from the laboratory ratrearing facility, ensuring that they have the same age, history, and other characteristics.

You give three experimental groups the drug, dissolved in saline solution and administered via injection. The first group receives a low dose, and the second, a moderate dose and the third a high dose. You give the fourth group an injection of fluid without the drug. You feed these groups three times a day with an adjusted diet equivalent to a human being's intake of excessive calories, designed to simulate obesity-inducing food quantities.

You measure the rats' weights and average the weights per group. You conduct these measurements on a daily basis for thirty days in the early morning before the feedings. The following are the groups and the treatments you give them:

Group A -obesity diet, low drug dose

Group B obesity diet, moderate drug dose

Group C -obesity diet, high drug dose

Group D - obesity diet, fluid without drug

Question 1

Which of the groups represents the control group?

Question 2

If all the rats in group C die, and none die in the other groups, what can be the most logical conclusion?

Question 3

What is the dependent variable in the experiment?

Question 4

You are trying to determine whether a coin will give fair result in a coin toss to decide who gets the ball in a football game. A fair coin will have an equal chance of giving a head or a tail for an outcome. You flip the coin 4 times with the following outcome: three heads and one tail. Based on these data you decide not to use it for a coin toss. Is this a valid conclusion?

Question 5

Which of the following is the least scientific question?

Explanation / Answer

Q1

The purpose of control group in an experiment is to compare the test results to a controlled setting. This will give us information to observe the difference between the results in normal conditions.

Here, the control group is Group D-obesity diet, fluid without drug

Q2

The more logical conclusion is 1. The drug dosage is too high, leading to malnutrition, which caused the deaths.

Q3

The weight of the rats is the dependent variable in the experiment.

Hence, the correct option is 3. The weight of the rats

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