Answer:
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Answer:
Option: C. 9 months
Explanation:
Benjamin infant niece hides her face as the stranger smile at her. The reaction is common at the age of 9 months because during this period a child gets to recognize people around him or her. She will be shy to unknown persons and hesitate to mix with them. In the same time, Benjamin niece looks back as the women after hiding her face in his shoulder because she is also curious about that person who is outside her family.
Answer:
This is an example of: <u>a sample survey.</u>
Explanation:
In the experiment to determine the effect of sleep deprivation on the ability of the student to concentrate definitely needs an experimental setup rather than a randomized data collection.
<em>Do to the fact that, the experimental used a small sample sized area (Students in a calculus class) to test his hypothesis shows that the setup is a sample survey. </em>
<u>This sample survey result could be extrapolated to the whoe region (the classes in the school or whole school ) to determine if there was a major significance between the two variables.</u>
