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user100 [1]
3 years ago
14

A study examined the alertness benefits of higher caffeine intake. In the study, the researchers investigated the link between d

aily caffeine intake and alertness at work (measured on a 7-point scale where 1-"not alert and 7- 'very alert"). Participants for the study were those who used a popular social networking Web site. Of the respondents, those who had very were excluded, leaving a sample size of 43 respondents. Complete parts a through high or very low intakes c below. b. Do the data represent a population or a sample?
A. The data represent a population since the data are all the units that are the subject of the study
B. The data represent a sample since the data are a subset of units.
C. The data represent a population since the data are a subset of units.
D. The data represent a sample since the data are all the units that are the subject of the study.
Mathematics
1 answer:
Katyanochek1 [597]3 years ago
3 0

Answer: B. The data represent a sample since the data are a subset of units.

Step-by-step explanation:

  • A population is the largest group of entire observations that can be made during a study.
  • A sample is a finite subset of the population that represents the entire population.

Here,

Population = Participants for the study were those who used a popular social networking Web site.

Since the entire data for the "persons used a popular social networking Web site" is not possible.

There have been taken a sample of them.

∴ Correct answer is B. The data represent a sample since the data are a subset of units.

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Elena and Lin are trying to solve 12x+3=72x+5. Describe the change they each make to each side of the equation.
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Answer:

No Solution

Step-by-step explanation:

12x + 3 = 72x + 5

subtract 12x from both sides

end up with

3 = 72x - 12x + 5

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My way

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Hope this Helped :)

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