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3 years ago

Can someone please help me out with number 3

Mathematics

1 answer:

Misha Larkins [42]3 years ago

5 0

2 and .02 because you have to move the decimal place so when you multiply u move the decimal to the right and when you divide u move it to the left
lol i was bout to go to bed but i saw this and i was like i got u XD but hope that helps

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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

A line passes through the point (-4,1) and has a slope of 3/2

anzhelika [568]

Answer:

y=3/2x+7

Step-by-step explanation:

y=mx+b

m=3/2

b=7

4 0

4 years ago

Consider the graphs of f(x) and g(x).

butalik [34]

Answer:

The value of k is -7

Step-by-step explanation:

We are given the graph of f(x) and g(x). If g(x)=f(x)+k

If we shift f(x) k unit vertical get g(x).

If k>0 then shift up

If k<0 then shift down.

f(x) and g(x) are both parabola curve.

First we find the vertex of f(x) and g(x)

Vertex of f(x) = (3,1)

Vertex of g(x) = (3,-6)

We can see change in y co-ordinate only.

f(x) shift 7 unit down to get g(x)

g(x)=f(x)-7

Therefore, The value of k is -7

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3 years ago

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The value of 2 to the 3rd power + 3 to the 3 power = ___.

Arturiano [62]

35.

2*2= 4*2=8

3*3=9*3=27

27+8=35

So the answer is 35. Hope this helps

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3 years ago

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. Add and reduce to lowest terms: 3 + 8/15

makkiz [27]

Answer:

11/15

Step-by-step explanation:

Add 3 to the numerator which is 8 and that would equal 11 so your complete fraction should be 11/15.

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3 years ago

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