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andre [41]
3 years ago
12

PLEASE HELP!!!!

Biology
1 answer:
adelina 88 [10]3 years ago
4 0

Answer:

As I think the answer is D.

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The Cretaceous–Paleogene extinction, which occurred around 66 million years ago, is defined as a mass extinction that wiped out around three-quarters of species on Earth.

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This event is marked by the presence of a sediment layer known as the K-Ph boundary which showed important levels of iridium, an element that is abundant in craters. Therefore, after its discovery, scientists hypothesize this extinction occurred due to the impact of the giant Chicxulub crater which changed the conditions of the atmosphere.

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3. What structure is used to transport organic molecules from the leaf to other parts of the plant?
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In a stream channel, what will be deposited first?
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Read 2 more answers
Humerus bones from the same species of animal have approximately the same length-to-width ratios. It is known that Species A has
Dima020 [189]

Answer:

The unearthed Humerous bones don't belong to the species A.

Explanation:

Hello!

You are studying the Humerus bones species A, who is known to have a mean ratio of 8,5. This value corresponds to the population mean of the length-to-with ratio of bones of species A, symbolized as μ.

The hypothesis you want to study is "The Humorous bones unearthed belong to the species A" if you assume this to be true, then the mean of the length-to-with ratio should be equal to the known population mean of the length-to-with ratio.

Symbolized:

H₀: μ = 8,5

H₁: μ ≠ 8,5

Significance level: α: 0,05

You are asked to use a Z-test, since you don't know the value of the population variance, but have the sample values, the sample size is big enough (more than n=30). Assuming that the sample values are independent, the statistic test of choice is the approximation:

Z= \frac{x_bar-μ}{S\sqrt[]{n} }≅N(0;1)

The critical region, in this case, it's a two-tailed test (remember the type is determined by the null hypothesis) so you'll have two critical values.

Left value [/tex]Z_{\alpha/2} = Z_{0,025} = -1,96

Right value Z_{1-\alpha/2} = Z_{0,975} = 1,96So you'll reject the null hyphotesis if the calculated [tex]Z_{obs} value is ≤-1,96 or ≥1,96 and you'll support it if -1,96<Z_{obs}<1,96

Now we calculate the statistic by replacing the formula with the data:

x_bar = 9,26

S = 1,20

n = 41

Z_{obs}= \frac{x_bar-μ}{S\sqrt[]{n} }

Z_{obs}= \frac{9,26-8,5}{1,20\sqrt[]{41} }

Z_{obs}= 4,0553

Since the calculated value falls in the rejection region, this means, you have statistically significant results. In other words you can reject the null hipothesis (H₀: μ = 8,5) and asume that the unearthed Humerous bones don't belong to the species A.

I hope you have a SUPER day!

7 0
3 years ago
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