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3 years ago

8

I need help please?!!!!!!!!!!!!!!!

1 answer:

Fynjy0 [20]3 years ago

8 0

Answer: The inequality symbol is reversed

Step-by-step explanation:

Given : 3 > -6

If we we multiply both side by -3 , we will have

-3(3) < -6(-3)

-9 < 18

the inequality symbol changes because , in the rule of inequalities , anytime we multiply or divide through by negative , the inequality symbol must change

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Construct the 90% confidence interval for the proportion of students at the college who have completed their required English 10

igomit [66]

Answer:

The confidence interval has an lower limit of $\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = \pi - 1.645\sqrt{\frac{\pi(1-\pi)}{n}}$ and an upper limit of $\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = \pi + 1.645\sqrt{\frac{\pi(1-\pi)}{n}}$ , in which $\pi$ is the sample proportion and $n$ is the size of the sample.

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 z-score that has a p-value of $1 - \frac{\alpha}{2}$ .

90% confidence level

So $\alpha = 0.1$ , z is the value of Z that has a p-value of $1 - \frac{0.1}{2} = 0.95$ , so $Z = 1.645$ .

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = \pi - 1.645\sqrt{\frac{\pi(1-\pi)}{n}}$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = \pi + 1.645\sqrt{\frac{\pi(1-\pi)}{n}}$

The confidence interval has an lower limit of $\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = \pi - 1.645\sqrt{\frac{\pi(1-\pi)}{n}}$ and an upper limit of $\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = \pi + 1.645\sqrt{\frac{\pi(1-\pi)}{n}}$ , in which $\pi$ is the sample proportion and $n$ is the size of the sample.

8 0

4 years ago

Is blood pressure a discrete or continuous variable?

stiv31 [10]

Answer:

discrete

explanation:

Continuous keeps going but for blood pressure it has to stay in a certain zone.

4 0

3 years ago

2x-5y=-28 find the value of y when x equals -19

nydimaria [60]

<h3>Question:</h3>

2x-5y=-28 find the value of y when x equals -19

<h3>Answer:</h3>

Y = - 2

<h3>Step-by-step explanation:</h3>

First you plug in -19 where x is 2(-19)-5y = -28

Remove parentheses -2 · 19-5y= -28

Multiply -2 by 19 -38-5y= -28

Add 38 to both sides -5y = 10

Divide both sides by -5 [tex]\frac{-5y}{-5} =\frac{10}{-5}[/tex

you will get -2 which is the answer.

Hope this helped!

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4 years ago

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Is this graph a function?

Diano4ka-milaya [45]

Yeah it’s a sin graph

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3 years ago

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Sedaia [141]

Answer:

Step-by-step explanation:

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3 years ago