Close shave Which of two brands (XorY)of electric razor shaves closer? Researchers

want to design and carry out an experiment to answer this question using 50adult male

volunteers. Here’s one idea: Have all 50subjects shave the left sides of their faces with the

Brand Xrazor and shave the right sides of their faces with the Brand Yrazor. Then have

each man decide which razor gave the closer shave and compile the results.

a. Identify any flaws you see in the proposed design for this experiment.

b. Describe how you would design the experiment. Explain how your design addresses

each of the problems you identified in part (a).

Short Answer

Expert verified

Our required answers are:

(a) Men's dominant hand may have a greater impact on shave closeness than razor quality

(b) Divide 50volunteers into two groups of 25each

Step by step solution

01

Part (a) Step 1: Given Information

We are given razor of two brands Xand Y. We take an experiment on 50adult men's in which they shave their left sides of their faces with the Brand Xrazor and shave the right sides of their faces with the Brand Yrazor. We need to find flaw in experiment conducted.

02

Part (a) Step 2: Explanation

There is flaw in experiment due to reason that man's dominant hand may have a greater impact on shave closeness than razor quality. As this will not give us our accurate result.

03

Part (b) Step 1: Given Information

We are given razor of two brands Xand Y. We take an experiment on 50adult men's in which they shave their left sides of their faces with the Brand Xrazor and shave the right sides of their faces with the Brand Y razor. We need to design experiment to remove flaw we have found in part(a)

04

Part (b) Step 2: Explanation

We can remove flaw in experiment by dividing 50volunteers into two equal groups and give one group razor of brand Xand another group razor of brand Y, then compare length of hair left after shaving that will lead to more accurate data as compare to previous result.

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Most popular questions from this chapter

Cocoa and blood flow A study of blood flow involved 27healthy people aged 18to 72. Each subject consumed a cocoa beverage containing 900milligrams of flavonols daily for 5days. Using a finger cuff, blood flow was measured on the first and fifth days of the study. After 5 days, researchers measured what they called “significant improvement” in blood flow and the function of the cells that line the blood vessels. What flaw in the design of this experiment makes it impossible to say if the cocoa really caused the improved blood flow? Explain your answer.

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