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3 years ago

Use the table below and write an equation to show the relationship between x and y

Mathematics

2 answers:

Naddik [55]3 years ago

4 0

Your answer should be d !

MAXImum [283]3 years ago

3 0

Answer:

Step-by-step explanation:

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Stephen deposited 5800 in a new savings account. The savings account earns 8.0% annually and simple interest. How much is the ac

Serga [27]

Answer:

$7,192

Step-by-step explanation:

8% of 5800= 464

464x3 = 1392

5800 + 1392 = 7,192

6 0

3 years ago

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A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size sample should be obtained i

Scorpion4ik [409]

Answer:

a) We need a sample size of at least 3109.

b) We need a sample size of at least 4145.

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 zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

The margin of error is:

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

99% confidence level

So $\alpha = 0.01$ , z is the value of Z that has a pvalue of $1 - \frac{0.01}{2} = 0.995$ , so $Z = 2.575$ .

(a) he uses a previous estimate of 25%?

we need a sample of size at least n.

n is found when $M = 0.02, \pi = 0.25$ . So

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

$0.02 = 2.575\sqrt{\frac{0.25*0.75}{n}}$

$0.02\sqrt{n} = 2.575\sqrt{0.25*0.75}$

$\sqrt{n} = \frac{2.575\sqrt{0.25*0.75}}{0.02}$

$(\sqrt{n})^{2} = (\frac{2.575\sqrt{0.25*0.75}}{0.02})^{2}$

$n = 3108.1$

We need a sample size of at least 3109.

(b) he does not use any prior estimates?

When we do not use any prior estimate, we use $\pi = 0.5$

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

$0.02 = 2.575\sqrt{\frac{0.5*0.5}{n}}$

$0.02\sqrt{n} = 2.575\sqrt{0.5*0.5}$

$\sqrt{n} = \frac{2.575\sqrt{0.5*0.5}}{0.02}$

$(\sqrt{n})^{2} = (\frac{2.575\sqrt{0.5*0.5}}{0.02})^{2}$

$n = 4144.1$

Rounding up

We need a sample size of at least 4145.

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3 years ago

When a mathematician writes QED at the end of a proof, what does this

blondinia [14]

(C)

Step-by-step explanation:

Q.E.D means "quod erat demonstrandum" indicating that the proof is completed.

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3 years ago

I need help with this please

Maurinko [17]

Answer:

Not a function because there are two values of y for x = -8.

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3 years ago

Assume you drive 12,000 miles per year and that regular gas will cost $2.25/gallon and that premium gas will cost $0.30/gallon m

goblinko [34]

Have to say the answer is B

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3 years ago

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