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3 years ago

5

What sample size would you need in order to have a 94% confidence interval that is 8% wide? Do this calculation twice: once with

the previous sample proportion, then again using the "safe" sample proportion. Comment on how these two answers compare tp each other.

1 answer:

balu736 [363]3 years ago

3 0

U would need 25% to equal wide

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Answer number 5 click image.

natita [175]

That makes 55200*0.62=34224 people.
So 34224 people voted.

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4 years ago

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Consider three events A, B and C with following properties.

lisov135 [29]

By the inclusion/exclusion principle,

$\mathbb P(D)=\mathbb P(A\cup B\cup C)$
$\mathbb P(D)=\mathbb P(A)+\mathbb P(B)+\mathbb P(C)-\bigg(\mathbb P(A\cap B)+\mathbb P(A\cap C)+\mathbb P(B\cap C)\bigg)+\mathbb P(A\cap B\cap C)$
$\mathbb P(D)=\dfrac14+\dfrac16+\dfrac14-\dfrac39+\dfrac1{13}$
$\mathbb P(D)=\dfrac{16}{39}\neq1$

So the union of A, B, and C does not constitute the entire sample space.

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3 years ago

The table shows the number of feathers Patsy the Peacock sold at each of the 8 festivals this year.

Vlada [557]

Answer:

75%

Step-by-step explanation:

It's right

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3 years ago

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Please help me! Use the appropiate lines to solve the question 3x+1=10

lbvjy [14]

Answer:

Step-by-step explanation:

3x + 1 = 10

3x = 10 - 1

3x = 9

x = 9/3

x = 3

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3 years ago

The graph of f(x)=2x^3+x^2-4x-2 is shown. How many of the roots of f(x) are rational

Alexeev081 [22]

We can one theorem to help us find rational roots of this polynomial.

2x^3 + x^2 - 4x - 2

We'll use Descartes' rule of signs.

Because there is 1 sign change, 1 of the 3 roots will be positive.

Now we can make the value of x -1 to see how many negative roots there will be.

-2 + 1 + 4 - 2

There are 2 sign changes, so we know there will be 2 negative roots.

Because of this, we should have 3 real, rational roots.

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3 years ago

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