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3 years ago

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Talja [164]3 years ago

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Answer:

hey I'm sorry did you ever get the answer yo this question

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A(2,y)∈ d:2x-3y+5=0 .y=?

lions [1.4K]

Brainly isnt good for math go to the website math way

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3 years ago

Does anyone else just go here and answer questions for fun cus ur bored or is that just me..?? REEEEEEEEEEEEEEEEEEEEEEEEEEEEE i

Gre4nikov [31]

Answer:

Hey let's be friends!!!

Step-by-step explanation:

4 0

3 years ago

Read 2 more answers

What is the value of the expression 8p4

Nady [450]

ANSWER

$8P_4 = 1680$

EXPLANATION

We use the formula

$nP_r = \frac{n!}{(n - r)!}$

For

$8P_4$

and n=8, r=4.

$8P_4= \frac{8!}{(8- 4)!}$

This simplifies to

$8P_4= \frac{8!}{4!}$

We expand the numerator using factorial notation,

$8P_4= \frac{8 \times 7 \times 6 \times 5 \times 4!}{4!}$

The common factors cancel out.

$8P_4= 8 \times 7 \times 6 \times 5$

$8P_4= 1680$

3 0

3 years ago

Suppose that the epidemiologist wants to re-estimate the population proportion and wishes for her 95% confidence interval to hav

Svetllana [295]

Answer:

She needs a sample of at least 385.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

The margin of error is:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

95% confidence level

So $\alpha = 0.05$ , z is the value of Z that has a pvalue of $1 - \frac{0.05}{2} = 0.975$ , so $Z = 1.96$ .

How large a sample should she take to achieve this?

She needs a sample of size at least n.

n is found when M = 0.04.

We do not know the true population proportion, so we use $\pi = 0.5$ , which is the case for which we are going to need the largest sample size.

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.05 = 1.96\sqrt{\frac{0.5*0.5}{n}}$

$0.05\sqrt{n} = 1.96*0.5$

Dividing both sides by 0.05

$\sqrt{n} = 19.6$

$(\sqrt{n})^{2} = 19.6^{2}$

$n = 384.2$

Rounding up

She needs a sample of at least 385.

3 0

3 years ago

Give the slope of the graph and the unit rate.

Oksana_A [137]

The slope is 4/3 the unit rate is 1

3 0

3 years ago