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Mrac [35]
3 years ago
7

A psychologist is interested in the relationship between the number of times a baby is held during a day and how often the baby

cries. The psychologists observe several day care centers where infants are being cared for and record the number of times each baby is held and the number of times each baby cries throughout the day. The data shows that babies who are held more tend to cry less.
Scenario C involves which scientific method?
A. Retrospective study
B. Correlational method
C. Controlled experiment
D. Prospective study
Social Studies
1 answer:
Rzqust [24]3 years ago
3 0

Answer:

Option B (Correlational method) is the right answer.

Explanation:

  • A style of analysis approach where a certain researcher analyses 2 factors, recognizes as well as evaluates their statistical links without any foreign variable impact, is termed as Correlational method.
  • The association which always occurs between each trait within a person is found most frequently in psychiatric as well as other applicable fields of psychology.

Other given options aren't related to the given statement. So the above is the appropriate one.

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Suppose you find a rock that contains 10 micrograms of radioactive potassium-40, which has a half-life of 1.25 billion years. By
attashe74 [19]

Answer:

The rock is 3.75 billion years ago.

Explanation:

Given that:

Half life = 1.25 billion years

1 billion years = 10⁹ years

So,

Half life = 1.25 × 10⁹ years

t_{1/2}=\frac {ln\ 2}{k}

Where, k is rate constant

So,  

k=\frac {ln\ 2}{t_{1/2}}

k=\frac {ln\ 2}{1.25\times 10^9}\ year^{-1}

The rate constant, k = 5.5452 × 10⁻¹⁰ years⁻¹

Initial amount [A₀] = 80 micrograms

Final amount [A_t] = 10 micrograms

Using integrated rate law for first order kinetics as:

[A_t]=[A_0]e^{-kt}

So,  

10=80\times e^{-5.5452\times 10^{-10}\times t}

80e^{-5.5452\times \:10^{-10}x}=10

\frac{80e^{-5.5452\times \:10^{-10}x}}{80}=\frac{10}{80}

\ln \left(e^{-5.5452\times \:10^{-10}x}\right)=\ln \left(\frac{1}{8}\right)

x=\frac{10^{10}\times \:3\ln \left(2\right)}{5.5452}=3.75\times 10^9

So,

<u>The rock is 3.75 billion years ago.</u>

8 0
3 years ago
What is social security?​
mario62 [17]

Answer:

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7 0
3 years ago
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Explain who in the United States has the power to make foreign policy
Mumz [18]

Answer:

The president has the power to make treaties, with a two-thirds vote of the Senate, and has the power to make international agreements. ... The president can also influence foreign policy by appointing US diplomats and foreign aid workers.

Explanation:

7 0
3 years ago
Which statement best explains how the mirror works as a symbol?
Ugo [173]

Answer:

D). The mirror is a symbol of the need for self-reflection and a commitment to improving the world.

Explanation:

Symbols are meant to signify a more deeper meaning associated/presented to a common or simple thing or object.

As per the question, the mirror as a symbol could best be explained through option D as it represents a deeper symbolic meaning attached to the common object 'mirror'. <em>It portrays the mirror 'as a symbol of the need of self-reflection and a sort of commitment to improve or uplift' the world'.</em> Thus, <u>option D</u> is the correct answer.

4 0
3 years ago
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Gene is a 24-year-old stock clerk at a large supermarket. He recently broke his arm in a cycling accident. Because of his broken
Daniel [21]

Answer:

disability discrimination

Explanation:

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