A company claims its new keyboard increases typing speed, citing that employees who used the new keyboard typed faster than those who did not. Which of the following, if true, most weakens this conclusion?

Question

Read the following statements and answer the question that follows.
A. Back then, they were owned by companies and installed on their premises.
B. Rooms and servers began to replace computer mainframes in the 1990’s.
C. These were supplemented by processors from Intel, which by the mid-2000s translated its dominance of PC semiconductors into a near monopoly of the server market.
D. They mostly ran on chips made by IBM and HP, the big tech of the day.
E. Things started to change once again around a decade ago, when Amazon began selling some of its spare server capacity.
Which of the following combinations is the MOST logically ordered?

Answer 1

This is a selection-bias flaw. The comparison is unfair if the two groups were not similar to begin with. Option 4 shows the groups differed in skill beforehand, so the speed gap is explained without the keyboard, breaking the conclusion.

A company claims its new keyboard increases typing speed, citing that employees who used the new keyboard typed faster than those who did not. Which of the following, if true, most weakens this conclusion?

Show Hint

The Correct Option is D

Solution and Explanation

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