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mestny [16]
4 years ago
11

Help me out....my grades are bad I really need you guys help .... PLEASE. I am so done with life.

Mathematics
1 answer:
gladu [14]4 years ago
7 0

Answer:

Step-by-step explanation:

google might work better

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You want to estimate the proportion of kids between the ages of 12 and 15 who have tried marijuana. You take a random sample of
kirill115 [55]
<h2>Answer with explanation:</h2>

Let p represents the population proportion.

By considering the given information, we have

H_0: p=0.29\\\\H_a: p\neq0.29

∵ the alternative hypothesis is two tailed , so the test is two-tailed test.

Given : For sample size :n= 130,  \hat{p}=0.23

Test statistic: z=\dfrac{\hat{p}-p}{\sqrt{\dfrac{p(1-p)}{n}}}

z=\dfrac{0.23-0.29}{\sqrt{\dfrac{0.29(1-0.29)}{130}}}\\\\=-1.50762993902\approx-1.51

P-value (two -tailed test)=2P(z>|-1.51|)=0.1310434\approx 0.131

Since , the p-value (0.131) is greater than the significance level (0.03), so we accept the null hypothesis.

Thus , we conclude that we have sufficient evidence to support the null hypothesis  that the true population proportion of Maryland students who have smoked marijuana is 29% .

5 0
3 years ago
Anybody know the answer to the 2 last questions please?
Diano4ka-milaya [45]

Answer:

the answer to the first one should be 24.

Step-by-step explanation:

First one ~ 24 is a perfect square which means there is only one factor. if there is only one factor that means that the two sides are equal to each other.

3 0
3 years ago
3/8 - 1/4x =1/2 x - 3/4<br> please help solve for x and show work
cluponka [151]

Answer:

x=3/2 (or 1.5)

Step-by-step explanation:

Subtract 3/8 from both sides

Simplify

Subtract 1/2x from both sides

Simplify

Multiply both sides by 4

Simplify

Divide both sides by -3

7 0
3 years ago
Explain why the graph of the equation g(x)=-(x+1)^2-3 would be a parabola opening downward
Mrac [35]

We know that the parabola opens downwards because it has a negative leading coefficient.

<h3></h3><h3>Why the parabola opens downwards?</h3>

For any polynomial, the leading coefficient is the coefficient in the term where is the large exponent of the polynomial.

The sign of that coefficient will determine the end behavior of the graph of the polynomial.

For the case of the parabola, a positive leading coefficient means that the parabola opens upwards, while a negative leading coefficient will mean that the parabola opens downwards.

Now, if you look at our parabola:

g(x) = -(x + 1)^2 - 3

You can see that there is a negative sign, thus when we expand the parenthesis, we will end up with a negative leading coefficient:

g(x) = -x^2 - 2x + 1 - 3 = -x^2 -2x - 2

So we know that the parabola opens downwards.

If you want to learn more about parabolas:

brainly.com/question/4061870

#SPJ1

7 0
2 years ago
Find the value of x. <br> 65°<br> (x + 12°)
Anna35 [415]

Step-by-step explanation:

Bring like terms together

6 0
3 years ago
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