The sample is the set of information Greg collects to do his estimation. The sample is necessarily a subset of the population. That is, in this case, the apartments listed in the local newspaper and the internet. He will estimate a mean rent for the sample and, with this result, estimate the population mean rent.

The population is the bigger set available for Greg to do the estimation, and the set he wants to estimate a parameter from (in this case, the mean rent).

In this case, the population is all the apartments near the college.

4 0

3 years ago

Sound waves can be ranked by their intensity, I, given in the formula below, where r is the distance from the source of a sound

Ket [755]

Answer:

D: r=1/2 sqrt(P/πI)

Step-by-step explanation:

P=4πIr²

We want to solve the equation for r

First divide each side of the equation by 4πI

P/4πI =4πIr²/4πI

P/4πI =r²

Then we need to take the square root of each side. Normally we would take the ± square root, but distance cannot be negative.

sqrt(P/4πI) = sqrt(r²)

sqrt(P/4πI) = r

Notice that there is a 4 in the denominator. sqrt(4) = 2

sqrt(P/πI)* 1/sqrt(4) = r

sqrt(P/πI)* 1/2 = r

1/2 sqrt(P/πI) = r

4 0

2 years ago