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3 years ago

Please help and provide instruction

Mathematics

1 answer:

Ket [755]3 years ago

4 0

Answer:

-12 -4x^2

Step-by-step explanation:

f(x) = -6 -2x^2

We want to find 2f(x) so multiply each term by 2

2f(x) = 2 ( -6 -2x^2)

Distribute

= -12 -4x^2

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Ten engineering schools in the United States were surveyed. The sample contained 250 electrical engineers, 80 being women; 175 c

steposvetlana [31]

Answer:

There is a significant difference between the two proportions.

Step-by-step explanation:

The (1 - <em>α</em>)% confidence interval for difference between population proportions is:

$CI=(\hat p_{1}-\hat p_{2})\pm z_{\alpha/2}\times\sqrt{\frac{\hat p_{1}(1-\hat p_{1})}{n_{1}}+\frac{\hat p_{2}(1-\hat p_{2})}{n_{2}}}$

Compute the sample proportions as follows:

$\hat p_{1}=\frac{80}{250}=0.32\\\\\hat p_{2}=\frac{40}{175}=0.23$

The critical value of <em>z</em> for 90% confidence interval is:

$z_{0.10/2}=z_{0.05}=1.645$

Compute a 90% confidence interval for the difference between the proportions of women in these two fields of engineering as follows:

$CI=(\hat p_{1}-\hat p_{2})\pm z_{\alpha/2}\times\sqrt{\frac{\hat p_{1}(1-\hat p_{1})}{n_{1}}+\frac{\hat p_{2}(1-\hat p_{2})}{n_{2}}}$

$=(0.32-0.23)\pm 1.645\times\sqrt{\frac{0.32(1-0.32)}{250}+\frac{0.23(1-0.23)}{175}}\\\\=0.09\pm 0.0714\\\\=(0.0186, 0.1614)\\\\\approx (0.02, 0.16)$

There will be no difference between the two proportions if the 90% confidence interval consists of 0.

But the 90% confidence interval does not consists of 0.

Thus, there is a significant difference between the two proportions.

4 0

3 years ago

Is Each Number Rounded Correctly to the nearest ten thousand?

zvonat [6]

You have correctly answered the last 3 questions in this list, so the answer to the first one left blank is no.

This is because 455,000 rounded to the nearest ten thousand is 460,000, rounding to 456,000 is rounding to the nearest one thousand.

I hope this helps!

5 0

3 years ago

Does anyone know this y=4^x

IRISSAK [1]

The answer will be c.

5 0

3 years ago

Read 2 more answers

I thought of a number. I added 15, tripled it and then subtracted 3 from the result. I got 42. What was my number?

Natasha_Volkova [10]

Answer:

Step-by-step explanation:

15 x 3 = 45 - 3 = 42

4 0

3 years ago

Please help!

zhannawk [14.2K]

Answer:

Step-by-step explanation:

cylinder's height=3×(diameter of sphere)=3×6=18 cm

radius of cylinder=3 cm

volume of cylinder=π r²h=π(3)²×18=162 π cm³

volume of sphere=4/3 π(3)³=36 π cm³

reqd. empty space=162 π-3×36π=54 πcm³

7 0

3 years ago