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mezya [45]
3 years ago
9

30 PIONTS AND BRAINLEST TO WHO EVER ANSWERS WITH A REASONABLE EXPLANATION . A newspaper started an online version of its paper 1

4 years ago. In a recent presentation to stockholders, the lead marketing executive states that the revenues for online ads have more than doubled that of the revenues for printed ads since starting the online version of the paper. Use the graph below to justify the lead executive’s statement. Determine the approximate year that the two ad revenues were equal.

Mathematics
1 answer:
inysia [295]3 years ago
4 0

Answer:

To find the year when the two ad revenues were equal, we need to find the point of intersection of the two lines, which, from the graph, seems to be closest to 6 years ago (8 years on the chart).

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Is the confidence interval affected by the fact that the data appear to be from a population that is not normally​ distributed?
sp2606 [1]

Answer:

D. No, because the sample size is large enough.

Step-by-step explanation:

The central limit theorem states that "if we have a population with mean μ and standard deviation σ and take sufficiently large random samples from the population with replacement, then the distribution of the sample means will be approximately normally distributed. This will hold true regardless of whether the source population is normal or skewed, provided the sample size is sufficiently large".

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".

If the sample size is higher than 30, on this case the answer would be:

D. No, because the sample size is large enough.

And the reason is given by The Central Limit Theorem since states if the individual distribution is normal then the sampling distribution for the sample mean is also normal.

From the central limit theorem we know that the distribution for the sample mean \bar X is given by:

\bar X \sim N(\mu, \frac{\sigma}{\sqrt{n}})

If the sample size it's not large enough n<30, on that case the distribution would be not normal.

7 0
3 years ago
What should be done to x^2 + 15x in order to create a perfect square?
lana [24]

\bf \qquad \textit{perfect square trinomial} \\\\ (a\pm b)^2\implies a^2\pm \stackrel{\stackrel{\text{\small 2}\cdot \sqrt{\textit{\small a}^2}\cdot \sqrt{\textit{\small b}^2}}{\downarrow }}{2ab} + b^2 \\\\[-0.35em] ~\dotfill

\bf x^2+15x+\boxed{?}^2\implies \stackrel{\textit{we know the middle term is}}{2\sqrt{x^2}\cdot \sqrt{\boxed{?}^2}\implies 2x\boxed{?}}\qquad then\qquad 2x\boxed{?}=15x \\\\\\ \boxed{?}=\cfrac{15x}{2x}\implies \boxed{?}=\cfrac{15}{2}\qquad \impliedby \textit{we should add that much \underline{squared}} \\\\[-0.35em] ~\dotfill\\\\ x^2+15x+\left( \cfrac{15}{2} \right)^2\implies \left(x+ \cfrac{15}{2} \right)^2

5 0
3 years ago
Can you simplify (7+sqrt of 5)(3-sqrt of 5)
Delvig [45]
(7+√5)(3-√5)=21-7√5+3√5-5=16-4√5

Answer: (7+√5)(3-√5)=16-4√5
6 0
3 years ago
Mr. Walsh started off the new year with 200 Snickers bars. Each day he gave five students Snickers bars for doing a good job. Fi
patriot [66]

Answer:

200-5x

Step-by-step explanation:

X means the days that he gave the snickers bars

for example

at the second day he have 190 snickers bars left because:

200-5(2)= 190

5 0
3 years ago
Help me please on this question
nevsk [136]
A) 2/5 is your answer

To solve this use cross multiplication.

See attachment to see how I soled it using this method.

Hope this helps!

5 0
3 years ago
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