To solve an equation of the form a • bx = d, you should first divide both sides by the coefficient _____.

1 answer:

8 0

We have to isolate x on one side of the equation in order to solve the equation.
So, the very first step would be to divide both the sides by a.

This will leave us with:

bx = d/a

Next divide both sides by b to get x on the left hand side giving us the answer to the equation.

So, the answer to this question is "a"

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The Information Technology Department at a large university wishes to estimate the proportion of students living in the dormitor

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Answer:

$n=\frac{0.5(1-0.5)}{(\frac{0.05}{1.96})^2}=384.16$

And rounded up we have that n=385

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

Solution to the problem

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 99% of confidence, our significance level would be given by $\alpha=1-0.99=0.01$ and $\alpha/2 =0.005$ . And the critical value would be given by: