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3 years ago

How do you figure perimeter

Mathematics

2 answers:

marta [7]3 years ago

8 0

Answer:

You add up all the sides of the shape

Mashcka [7]3 years ago

8 0

Answer:

add all the sides.

Side +Side +Side +Side = perimeter

lets say a square has side lengths of 4. And 4+4+4+4 and that 16 so the perimeter is 16

Brainliest?

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Suppose that the epidemiologist wants to re-estimate the population proportion and wishes for her 95% confidence interval to hav

Svetllana [295]

Answer:

She needs a sample of at least 385.

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:

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

95% confidence level

So $\alpha = 0.05$ , z is the value of Z that has a pvalue of $1 - \frac{0.05}{2} = 0.975$ , so $Z = 1.96$ .

How large a sample should she take to achieve this?

She needs a sample of size at least n.

n is found when M = 0.04.

We do not know the true population proportion, so we use $\pi = 0.5$ , which is the case for which we are going to need the largest sample size.

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

$0.05 = 1.96\sqrt{\frac{0.5*0.5}{n}}$

$0.05\sqrt{n} = 1.96*0.5$

Dividing both sides by 0.05

$\sqrt{n} = 19.6$

$(\sqrt{n})^{2} = 19.6^{2}$

$n = 384.2$

Rounding up

She needs a sample of at least 385.

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3 years ago

An academic advisor calculated the mean GPA for college freshmen to be 2.33, with a standard deviation of 1.06. The advisor know

AfilCa [17]

Answer:Average error will be less

Step-by-step explanation: Prediction error refers to the difference between the the actual and predicted value of an observation. Using correlation analysis or study, The level or degree of correlation or relationship between two measured variables usually determines the variation or measure of the prediction error. If there is no relationship or correlation between two measured variables, if such model is used to make prediction, the average prediction error will be very high. However, since it is stated that there exist a relationship between high school GPA and Freshman-year GPA, then making prediction based on this assertion will lessen the average prediction error.

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3 years ago

Jack began constructing ΔDEF to be congruent to ΔABC by copying side AC to form DF. Could Jack use ASA to complete the construct

Katarina [22]

Answer:

c. yes, he should copy ∠A and ∠C.

Step-by-step explanation:

just took the test

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4 years ago

Read 2 more answers

you are building a rectangular wading pool you want the area of the bottom to be 90 ft squared you want the length of the pool t

katrin2010 [14]

We can form a system of equations:
x*y=90
and
x=2y+3.
Solving gives dimensions of 15 feet by 6 feet.

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3 years ago

DOES ANYONE KNOW HOW TO DO THIS????????????????????????

True [87]

Answer:

0.25 per gallon

slope: 0.25

Step-by-step explanation:

the train travels 25 miles per 100 gallons

this simplifies into 0.25 per 1 gallon

slope is y/x

y/x = 25/100 = 0.25

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3 years ago