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3 years ago

HELP ME PLS IM HELLA DUMB

Mathematics

1 answer:

Anna [14]3 years ago

6 0

Ur not dumb!!! i graphed the line for u here. i suggest watching some khan academy videos for extra practice!

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A small university has 200 first-year students. Historically at this university, 88% of first-year students graduate in four yea

Ira Lisetskai [31]

Answer: c is the answer . 176, 4.60

Step-by-step explanation:

just trust me bro

6 0

3 years ago

A newspaper article about the results of a poll states: "In theory, the results of such a poll, in 99 cases out of 100 should di

frutty [35]

Answer:

The sample size suggested by this statement is of at least 4145.

Step-by-step explanation:

This statement states that the 99% confidence interval has a margin of error of 2 percentage points.

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 $Z = 2.575$ .

Find the sample size suggested by this statement.

The sample size is at least n.

n is found when M = 0.02.

We don't know the true proportion, so we use $\pi = 0.5$ , which is when the largest sample size will be needed.

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

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

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

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

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

$n = 4144.14$

Rounding up

The sample size suggested by this statement is of at least 4145.

5 0

4 years ago

Felisha is thinking of a number that is 3 times the value of Monique's number. Felisha's number is also 3 more than 4 times the

sergey [27]

First u multipl 3 times 3 then 9 times 4 I think which is 36

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3 years ago

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Reil [10]

Answer:

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Step-by-step explanation:

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4 years ago

Learning task 3:solve the following.....

Alexus [3.1K]

Answer:

I don't know what is this

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3 years ago