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

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.

We are given razor of two brands $X$and $Y$. We take an experiment on $50$adult men's in which they shave their left sides of their faces with the Brand $X$razor 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)

We can remove flaw in experiment by dividing $50$volunteers into two equal groups and give one group razor of brand $X$and 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.