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3 years ago

Help please. This is a test man. I’m begging you

Mathematics

1 answer:

makvit [3.9K]3 years ago

8 0

Answer:

Negative slope and can I have brainliest

Step-by-step explanation:

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A news station would like to conduct an exit poll to determine the likelihood that a highly debated amendment will receive enoug

vladimir1956 [14]

Answer:

The expression is $n = (\frac{1.645*0.5}{0.03})^2$

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 $1 - \frac{\alpha}{2}$ .

The margin of error is of:

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

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 $Z = 1.645$ .

What expression would give the smallest sample size that will result in a margin of error of no more than 3 percentage points?

We have to find n for which M = 0.03.

We have no prior estimate for the proportion, so we use $\pi = 0.5$ . So

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

$0.03 = 1.645\sqrt{\frac{0.5*0.5}{n}}$

$0.03\sqrt{n} = 1.645*0.5$

$\sqrt{n} = \frac{1.645*0.5}{0.03}$

$(\sqrt{n})^2 = (\frac{1.645*0.5}{0.03})^2$

$n = (\frac{1.645*0.5}{0.03})^2$

The expression is $n = (\frac{1.645*0.5}{0.03})^2$

3 0

3 years ago

Solve 7(3-x)<5x-15 for x

stepan [7]

7(3 - x) < 5x - 15

Distribute 7 inside the parentheses.

21 - 7x < 5x - 15

Subtract 21 from both sides.

-7x < 5x - 36

Subtract 5x from both sides.

-12x < -36

Divide both sides by -12. The equality sign will get flipped because you are dividing by a negative.

x > 3

5 0

3 years ago

Find the complex number to solve the equation: 9(2-4i) - 6(x+yi) = 14-3i

tester [92]

$9(2-4i)-6(x+yi)=14-3i\\
18-36i-6x-6yi=14-3i\\
-6x-6yi=-4+33i\\
-6x=-4 \wedge -6y=33\\
x=\dfrac{4}{6} \wedge y=-\dfrac{33}{6}\\
x=\dfrac{2}{3} \wedge y=-\dfrac{11}{2}\\\\
\boxed{x+yi=\dfrac{2}{3}-\dfrac{11}{2}i}$

4 0

3 years ago

a ticket to a school dance is $8 ). usually, 300 students attend. the dance committee knows that for every $1 increase in price

Nataliya [291]

8 x 300 = 2400
9 x 270 = 2430
10 x 240 = 2400
11 x 210 = 2310
the max revenue would be $9

3 0

4 years ago

Jesse drank 3/4 of liter of water Monday before going jogging. He drank 3/5 of a liter of water after his jog. How much water di

charle [14.2K]

Answer:

$1\frac{7}{20}$

Step-by-step explanation:

Step one

Given data

On Monday, Jesse drank 3/4 of liter of water before jogging

and drank 3/5 of liter after jogging

In all, Jesse drank 3/4 and 3/5 liters of water

= 3/4+3/5

the lcm is 20

=15+12/20

=27/20

in mixed numbers(i.e a whole and a fraction together we have) we have

$1\frac{7}{20}$

8 0

3 years ago