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2 years ago

Answer this please Answer

Mathematics

2 answers:

lora16 [44]2 years ago

5 0

Answer:

the answer is a 6

Step-by-step explanation:

Sauron [17]2 years ago

3 0

Answer:

A. 6/10

Step-by-step explanation:

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When the sample size and the sample proportion remain the same, a 90 percent confidence interval for a population proportion p w

deff fn [24]

Answer:

A 90% confidence interval for p will be narrower than the 99% confidence interval.

Step-by-step explanation:

The formula to compute the (1 - α) % confidence interval for a population proportion is:

$CI=\hat p\pm z_{\alpha /2}\sqrt{\frac{\hat p(1-\hat p)}{n}}$

Here $\hat p$ is the sample proportion.

The margin of error of the confidence interval is:

$MOE= z_{\alpha /2}\sqrt{\frac{\hat p(1-\hat p)}{n}}$

The MOE is dependent on:

Confidence level
Standard deviation
Sample size

The MOE is directly related to the confidence level and standard deviation.

So if any of the two increases then the MOE also increases, thus widening the confidence interval.

And the MOE is inversely related to the sample size.

So if the sample increases the MOE decreases and vice versa.

It is provided that the sample size and the sample proportion are not altered.

The critical value of z for 90% confidence level is:

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

And the critical value of z for 99% confidence level is:

$z_{\alpha/2}= z_{0.05/2}=z_{0.05}=1.96$

So as the confidence level increases the critical value increases.

Thus, a 90% confidence interval for p will be narrower than the 99% confidence interval.

6 0

2 years ago

Whats an inverse function

vichka [17]

Answer:

In mathematics, an inverse function (or anti-function) is a function that "reverses" another function: if the function f applied to an input x gives a result of y, then applying its inverse function g to y gives the result x, and vice versa, i.e., f(x) = y if and only if g(y) = x.

Step-by-step explanation:

4 0

3 years ago

84.47 is 115% of what number

NISA [10]

155% of X = 84.47
1.55 of X = 84.47
X= 84.47/1.55
X=54.49 Answer

7 0

3 years ago

The weight of water is 62 and one half lb per cubic foot. What is the weight of 18 and one fourth cubic feet of? water? How much

Alla [95]

Answer:

Water - 62.5 pounds per cubic foot

18.25 cubic feet would weigh 18.25 * 62.5 =

1,140.625 pounds.

Step-by-step explanation:

4 0

3 years ago

Please explain how to solve this step by step, I know the answer, but need to explain it. 2n^4-10n^2-72

vovikov84 [41]

Answer:

2(n + 3)(n - 3)(n² + 4)

Step-by-step explanation:

Your polynomial is: P =2n⁴ - 10n² - 72

1. Remove the common factor

2n⁴ - 10n² - 72 = 2(n⁴ - 5n² - 36)

2. Factor the quadratic

P is a quadratic in n².

(a) Find two numbers that multiply to give -36 and add to give -5.

List the positive factors of 36: 1, 2, 3, 4, 6, 9, 18, 36

One of the numbers must be negative. Start with the numbers near the middle of the list.

By trial and error, you will find that -9 and +4 work:

-9 × 4 = 36 and -9 +4 = -5

(b) Rewrite -5n² as -9n² + 4n²

n⁴ - 9n² + 4n² - 36

(c) Factor the first two and the last two terms

n²(n² - 9) + 4(n² - 9)

(d) Separate the common factor

(n² - 9)(n² + 4)

So, P = 2(n² - 9)(n² + 4)

(e) Factor n² - 9

n² - 9 is the difference of two squares.

n² - 9 = (n + 3)(n - 3)

P = 2(n + 3)(n - 3)(n² + 4)

4 0

3 years ago