The concentration of DDT (C14H9Cl5), in milligrams per liter, is:(1) a nominal variable
(2) an ordinal variable
(3) an interval variable
(4) a ratio variable.

Answers

Answer 1

Answer:

Answer:

The correct answer is (4) a ratio variable

Step-by-step explanation:

Nominal, ordinal, interval, or ratio data are the four fundamental levels of measurement scales that are used to capture data.

Nominal scales are used for labeling variables, without any quantitative value.

Ordinal the order of the values is what is significant, but the differences between each one is not really known.

Interval we know both, the order and the exact differences between the values

Ratio they have the order, the exact value between units, and have an absolute zero

In this case, the concentration of DDT (C14H9Cl5), in milligrams per liter is a RATIO, because it has order, the exact value between units, and have an absolute zero

139=x

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Nielsen Media Research wants to estimate the mean amount of time, in minutes, that full-time college students spend texting each weekday.Find the sample size necessary to estimate that mean with a 15 minute margin of error. Assume that a 96% confidence level is desired and that the standard deviation is estimated to be 112.2 minutes.

Answers

Answer:

n=237

Step-by-step explanation:

Previous concepts

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".

Assuming the X follows a normal distribution

$X \sim N(\mu, \sigma=112.2)$

We know that the margin of error for a confidence interval is given by:

$Me=z_(\alpha/2)(\sigma)/(√(n))$ (1)

The next step would be find the value of $\z_(\alpha/2)$ , $\alpha=1-0.96=0.04$ and $\alpha/2=0.02$

Using the normal standard table, excel or a calculator we see that:

$z_(\alpha/2)=2.054$

If we solve for n from formula (1) we got:

$√(n)=(z_(\alpha/2) \sigma)/(Me)$

$n=((z_(\alpha/2) \sigma)/(Me))^2$

And we have everything to replace into the formula:

$n=((2.054(112.2))/(15))^2 =236.05$

And if we round up the answer we see that the value of n to ensure the margin of error required $\pm=15 min$ is n=237.

Geno invested $2,000 into an account that earns 8.5% interest compounded annually. Howmuch interest will Geno earn after 3 years?
HELP

Answers

8.5% interest would yield $170 annually for a total interest earnings of $510

Quadrilateral Practice Test, I’ll give brainliest to the correct answer with explanation

Answers

Answer:

120 Degrees

Step-by-step explanation:

Angle T and R are vertical angles meaning they are equal so combine the equations: 31x - 4 = 29x + 4, then solve using inverse operations

subtract 31x from both sides to get -4 = -2x + 4

Then subtract 4 from both sides to get -8 = -2x, now that we have isolated the variable we have to divide by -2 on both sides getting us x = 4, then plug in the four to the equation for angle R getting you 29 times 4 which equals 116 + 4 = 120

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