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Len [333]
3 years ago
11

A test for the level of potassium in the blood is not perfectly precise. Moreover, the actual level of potassium in a person's b

lood varies slightly from day to day. Suppose that repeated measurements for the same person on different days vary normally with sigma equals 0.02.
a) Julie's potassium level is measured once. The result is x-bar = 3.4. Give a 90% confidence interval for her mean potassium level.
Advanced Placement (AP)
1 answer:
Margaret [11]3 years ago
5 0
Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.

Below is the solution:

(a) <span>x bar = 3.
</span><span>n = 1
</span><span>std = 0.2
</span><span>z value = 1.645
</span>
<span>3 plus/minus 1.645 (0.2/(sqrt1))
</span>
<span>Interval = [3.07, 3.73]</span>
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Read these two passages from 1788, which are related to the debate over the ratification of the Constitution.
Bond [772]

Answer:

It promotes the concept of a strong federal government.

Explanation:

The first text reinforces the need to promote strong federal government. This concept was the main idea defended by the federalists and can be defended by the text when the author states that a people needs to be governed by a system that has the power to organize men, to control them in relation to their defects. The text shows that men are not angels, so it is necessary that a powerful system has the power to lead them. That powerful system is the federal government.

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3 years ago
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Answer:

Option A, GV law

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now the simplifications are:

a) GV Law

This is fine because with this method you will always remember that these are laws.

b) L of G

This could mean different things, it is not advisable to use this type of abbreviations, since you can read it and not remember what L or G means.

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I really don't understand what this means, this is not a good option.

d) Newt gravity.

This option is also good because you can remember Newton's name, but it is a bit longer than the first option.

So, the option that has more information and is also shorter is the first option of the GV law, so that would be the correct option

7 0
3 years ago
With a half life of 28.8 years, how long will it take 1g of strontium-90 to decay to 250 mg
soldier1979 [14.2K]

The time it takes for 1g of strontium-90 to decay to 250 mg is; 57.6 years

<h3>What is the half life of an element?</h3>

The formula for half life is;

A(t) = A₀ * (¹/₂)^(t/t_1/2)

Where;

A(t) is amount left after t years

A₀  the initial quantity of the substance that will undergo decay;

t_1/2 is the half-life of the decaying quantity.

We are given;

t_1/2 = 28.8 years

A₀ = 1 g

A(t) = 250 mg = 0.25 g

Thus;

0.25 = 1 *  (¹/₂)^(t/28.8)

log 0.25 = (t/28.8) log (1/2)

-0.60206 = (t/28.8) * -0.3010

t = 2 * 28.8

t = 57.6 years

Read more about half life at; brainly.com/question/11152793

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Got it right on ed21

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