Question

In: Statistics and Probability

Consider the experiments. Experiment 1: A study is done to determine which of two fuel mixtures...

Consider the experiments.

Experiment 1: A study is done to determine which of two fuel mixtures allows a rocket to travel farther over a period of time. Rocket A, which requires additional equipment to keep it stable, is used to test one fuel mixture, and rocket B is used to test the other. Both rockets are identical aside from their mass. The results indicate that rocket B traveled farther than rocket A over the same period of time.

Experiment 2: A double-blind experiment is performed to test whether a new drug is effective in lowering blood pressure. A random sample of subjects with high blood pressure is assigned to two groups. One group receives the new drug and the other group does not. Neither group is permitted to take any other medications during the experiment or to change their lifestyles in any way. The results of the experiment show that the drug is effective in lowering blood pressure.

Identify the experiment in which confounding occurs and the reason for its occurrence:

Neither experiment has a confounding variable.

Experiment 2 has a confounding variable related to the subjects used. Choosing a sample of subjects with high blood pressure instead of individuals with different blood pressure levels may confuse the results.

Experiment 2 has a confounding variable related to the type of experiment. A double-blind experiment may increase the risk of the placebo effect and possibly skew the results.

Experiment 1 has a confounding variable related to the fuel mixtures. Varying the fuel mixture could skew the results of the study and should be kept constant.

Experiment 1 has a confounding variable related to the mass of the rockets. Any variation in mass may cause a discrepancy in the distance traveled.

Expert Solution

Answer to the question)

In experiment 1 the two rockets are exactly same

But the speed also depends on mass

if one rocket is heavier it is bound to get lower speed as compared to the other one

Thus mass seems to be a confounding variable here

.

In experiment 2, it is a double blind experiment , which ensures that there would be no bias due to experimenter or the subject. Further the subjects are not allowed to take any medication or change their lifestyle. This ensures that no other variable confounds the experiment at all

Hence for experiment 2 there is no confounding variable

Based on the above explanation the correct answer for this question is:

"Experiment 1 has a confounding variable related to the mass of the rockets. Any variation in mass may cause a discrepancy in the distance traveled"

orchestra answered 2 years ago

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