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N76 [4]
2 years ago
14

The owner of a plant nursery will conduct a study to investigate whether a new fertilizer is more effective than an older fertil

izer in helping the growth of young tomato seedlings. The owner selects a simple random sample of 50 young tomato seedlings from all the young tomato seedlings in the nursery. Half of the selected seedlings will be randomly assigned to receive the new fertilizer, and the remaining seedlings will receive the older fertilizer. The growth of the seedlings will be recorded for the next month. What is the main reason in the study for selecting a simple random sample from the population?
Advanced Placement (AP)
2 answers:
Bezzdna [24]2 years ago
6 0

Answer:

A simple random sample selected from the population allows the results to be generalized to the population.

Explanation:

A simple random sample better represents the population as a whole.

Hope this helps!

bagirrra123 [75]2 years ago
5 0

Answer:

1. It reduces the probability of sampling bias.

2. A random sample will be more representative of the whole population.

3. Allows the researcher to determine the efficacy of the fertilizer.

Explanation:

Selecting a simple random simple from a large population is a widely used method in science. Researchers select a random sample so every individual, in this case seedling, has an equal chance to be selected.

Therefore, it is an accurate method that, although is not free from errors, avoids or reduces the probability of sampling bias. Selecting a truly random tomato seedling will be more representative of the whole population of seedling instead of selecting carefully a seedling that already has specific or desired characteristics. Hence, this random sampling will allow the researcher to determine the efficacy of the fertilizer.

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Explanation:

1. Calculate Maddie's inflation adjusted income

\text{Inflation adjusted income} = \text{2012 income} \times \dfrac{\text{2013 CPI}}{\text{2012 CPI}}\\\\= 33 000 \times \dfrac{125}{110} = \$37 500

Maddie should be earning $37 500 in 2013 just to keep up with inflation.

2. Calculate the percent change in Maddie's real income.

Maddie is "real" salary is only $35 000.

\text{\% Change} = \dfrac{\text{real - expected}}{\text{expected}} \times 100 \, \%\\\\= \dfrac{35 000 - 37 500 }{37 500} \times \, 100 \% = \dfrac{-2500}{37 500} \times 100 \, \% = \mathbf{-6.7 \, \%}

The percent change in Maddie's real income is -6.7 %.

Maddie was certainly hurt by this inflation.

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balu736 [363]

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Researchers are investigating whether people who exercise with a training partner have a greater increase, on average, in target
alexandr402 [8]

The conclusion that you will be able to reach if method I is used that cannot be concluded if method II is used is that the results can be generalized to the population as a whole.

In method I, the researchers decided to recruit volunteers. This sample includes people who do not exercise, people who exercise alone and people who exercise with a partner. On the other hand, method II will recruit participants at a community fitness center. Therefore, this sample will not include people who do not exercise. This means that method I will have a sample that is more representative of the general population.

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