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patriot [66]
3 years ago
6

Horatio has developed a new test for ADHD. He is trying out his new test on about 500 children, half of whom have already been d

iagnosed with an established clinical measure. The results of his new test say only 100 of the children have ADHD and the rest do not. In this case, the new test has missed identifying 150 children who really did have ADHD. This example illustrates making a(n) ______ error during hypothesis testing. Group of answer choices Type I Type II null hypothesis alternative hypothesis
Social Studies
1 answer:
Tatiana [17]3 years ago
8 0

Answer:

Type I error

Explanation:

Type I error is a statistical significance. It does not prove the correct result in a research hypothesis. Here the p-value is based on the probabilities.

In this phenomenon, there are always chances of making an incorrect conclusion. It is related to accepting and rejecting the null hypothesis.

In this research, there are another four options possibilities in which there are two correct and two incorrect error representation. These errors are inversely proportioned.

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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 other visuals could be used to teach someone how to create a tornado?
Likurg_2 [28]

Answer:

Explanation:flow chart

6 0
3 years ago
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Extension of railroads + Invention of barbed wire + Overgrazing of land = Which of the following does the list above best descri
jolli1 [7]

Answer:

Option D, The end of the great Texas cattle drives​, is the right answer.

Explanation:

The Spanish settlers were the first to bring the longhorn cattle in North America. During the course of time, Texas became home to millions of longhorn cattle. The cattle ranchers of the area wanted to sell them in the markets of East and North for the reason the demand was high and the supply was low. Such cattle drives came to an end in the decade of 1880s for various reasons. The invention of barbed wire, the expansion of railroads and too many cattle grazed on the crowded ranges and thus there was not enough grass to feed them all, were some of the significant reasons.

4 0
3 years ago
The “final solution” refers to ___________.
bija089 [108]

Answer:

A

Explanation:

It was the mass murder of Jews

7 0
2 years ago
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Which city is most likely has a semi-arid climate, with short rainy seasons.....
solmaris [256]
A the answer is a because like i just know because i’m smart
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