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3 years ago

How do we post a picture?

Mathematics

1 answer:

svet-max [94.6K]3 years ago

3 0

Answer:

click on the thing that looks like a paper clip and pick the pic u wanna post

Step-by-step explanation:

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3 years ago

Which statement explains why 13x−13y=−26 shares a solution with this system of equations:

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2 years ago

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WITCHER [35]

$(f-g)(x) = f(x) - g(x) = (3x-5) - (x+3) = 2x -8$

Choice D

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3 years ago

Please solve #5 and explain how you solved it

Ira Lisetskai [31]

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2 years ago

Read 2 more answers

The population standard deviation for the heights of dogs, in inches, in a city is 3.7 inches. If we want to be 95% confident th

Aleks04 [339]

Answer:

The minimum sample size that can be taken is of 14 dogs.

Step-by-step explanation:

The formula for calculating the minimum sample size to estimate a population mean is given by:

$n=\frac{z^{2}\sigma^{2}}{e^{2}}$

The <u>first step</u> is obtaining the values we're going to use to replace in the formula.

Since we want to be 95% confident, $1-\alpha=0.95 \Rightarrow \alpha=0.05$ .

Therefore we look for the critical value $z_{\alpha/2}=1.96$ .

Then we calculate the variance:

$\sigma = 3.7 \Rightarrow \sigma^{2}=13.69$

And we have that:

$e=2 \Rightarrow e^{2}=4$

<u>Now</u> we replace in the formula with the values we've just obtained:

$n=\frac{1.96^{2}*13.69}{4}=13.1479\approx 14$

Therefore the minimum sample size that can be taken to guarantee that the sample mean is within 2 inches of the population mean is of 14 dogs.

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3 years ago