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3 years ago

What is the LCD for 11/21 and 31/45

Mathematics

1 answer:

Leokris [45]3 years ago

8 0

There is none except for eleven and that is it

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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

2 years ago

Find The Area Of The Shape Shown Below

Nitella [24]

Answer:

<h2>6 units^2</h2>

solution,

Area of trapezoid:

$\frac{a + b}{2} \times h \\ = \frac{2 + 4}{2} \times 2 \\ = \frac{6}{2} \times 2 \\ = 6 \: {units}^{2}$

Hope this helps..

Good luck on your assignment..

7 0

2 years ago

Read 2 more answers

In a conference room, the number of small tables,s, is twice the number of large tables, t. Which equation matches the informati

nasty-shy [4]

You and add cause this sound like a problem where you add

7 0

3 years ago

Help on a time limit!

hichkok12 [17]

C I petty sure the answer is c

4 0

2 years ago

A triangle has one 90-degree angle and one 38.7 - degree angle. What is the measure of the third angle?

tigry1 [53]

The answer is 51.3 degrees because you add 90+38.7=128.7
then you do 180-128.7 because this is a linear/ supplementary triangle which adds up to 180
and you get 51.3 degrees

4 0

3 years ago