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loris [4]
3 years ago
6

I DON’T UNDERSTAND THIS!!!

Mathematics
1 answer:
storchak [24]3 years ago
6 0
The answer to the question

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"a pollster wishes to estimate the number of left-handed scientists. how large of a sample is needed in order to be 98% confiden
nadezda [96]
The sample size should be 250.

Our margin of error is 4%, or 0.04.  We use the formula

\text{ME}=z\sqrt{\frac{\hat{p}(1-\hat{p})}{n}}

To find the z-score:
Convert 98% to a decimal:  0.98
Subtract from 1:  1-0.98 = 0.02
Divide both sides by 2:  0.02/2 = 0.01
Subtract from 1:  1-0.01 = 0.99

Using a z-table (http://www.z-table.com) we see that this value has a z-score of approximately 2.33.  Using this, our margin of error and our proportion, we have:

0.04=2.33\sqrt{\frac{0.08(1-0.08)}{n}}
\\
\\0.04=2.33\sqrt{\frac{0.08(0.92)}{n}}

Divide both sides by 2.33:
\frac{0.04}{2.33}=\sqrt{\frac{0.08(0.92)}{n}}

Square both sides:
(\frac{0.04}{2.33})^2=\frac{0.08(0.92)}{n}

Multiply both sides by n:
(\frac{0.04}{2.33})^2n=0.08(0.92)

Divide both sides to isolate n:
\frac{0.08(0.92)}{(\frac{0.04}{2.33})^2}=n
\\
\\249.73=n
\\n\approx 250
4 0
3 years ago
Help a girl out please!
NeX [460]
Even function
(unchanged under reflection over y-axis)

Hope this helped :)
4 0
1 year ago
What are these as equalivalent equations
tatiyna

Answer:

6x - 2(x - 3) and x + 3(x - 2) - 6

The two expresaions that are quivalent are <u>6x - 2(x - 3)</u> and <u>x + 3(x - 2) - 6</u>.

Step-by-step explanation:

First expression which is 4(x - 3) is an example of a binomial that when multiplied together, the product would be 4x - 12. Therefore, second and third expressions are the answer.

#CarryOnLearning

#BrainliestBunch

#LetsStudy

#AnswerForTrees

#BrainlyFast

#BuwanNgWikaSaBrainly

4 0
2 years ago
How to I get 25ft to centimeters?
Lady bird [3.3K]

Answer:

762 centimeters

Step-by-step explanation:

One feet equals to 30.48

6 0
2 years ago
Which equation shows<br><br> equation shows y = - 3x +4<br><br> x + 4 is in standard form?
svet-max [94.6K]

Answer:

7x-y=-4

Step-by-step explanation:

Let me know if this right please :(

Hope it was is helpful for you :)

3 0
2 years ago
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