Astudy conducted over a period of ten years assessed the income growth of people right out of college. the study began with a sample of 76 people, but by they 10th year the study was in contact with only 68 of the original participants.
a) missing data
b) self interest
c) precise numbers
d) voluntary response

The correct answer will be option-A

Explanation:

The key components of an investigation are the experiments and the results.

In the given question, since the study was conducted over 76 people for 10 years out of which data of only 68 people were collected after 10 years.

This will lead to disturb the analytical part of the results as the data of 8 experimental samples is missing. Therefore the hypothesis of the experiment would not be tested.

Thus, option-A is the correct answer.

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or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!