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3 years ago

I need your help!!

1 answer:

4 0

Carla ants you to create a course about a personality inventory. She says the course will help managers be more empathetic. She’s already created a slide deck,so it should be easy!

There is your scenario hope this helped oh and can you mark me brainliest

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In the diagram, BA || CD, CB = DB, mLC = 5(x – 3), and

labwork [276]

Answer:

90 por que eso mide cada ángulo

7 0

3 years ago

A researcher reports survey results by stating that the standard error of the mean is 25 the population standard deviation is 40

bezimeni [28]

Answer:

a) A sample of 256 was used in this survey.

b) 45.14% probability that the point estimate was within ±15 of the population mean

Step-by-step explanation:

This question is solved using the normal probability distribution and the central limit theorem.

Normal probability distribution

When the distribution is normal, we use the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

Central Limit Theorem

The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean $\mu$ and standard deviation $\sigma$ , the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean $\mu$ and standard deviation $s = \frac{\sigma}{\sqrt{n}}$ .

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

a. How large was the sample used in this survey?

We have that $s = 25, \sigma = 400$ . We want to find n, so:

$s = \frac{\sigma}{\sqrt{n}}$

$25 = \frac{400}{\sqrt{n}}$

$25\sqrt{n} = 400$

$\sqrt{n} = \frac{400}{25}$

$\sqrt{n} = 16$

$(\sqrt{n})^2 = 16^2[tex][tex]n = 256$

A sample of 256 was used in this survey.

b. What is the probability that the point estimate was within ±15 of the population mean?

15 is the bounds with want, 25 is the standard error. So

Z = 15/25 = 0.6 has a pvalue of 0.7257

Z = -15/25 = -0.6 has a pvalue of 0.2743

0.7257 - 0.2743 = 0.4514

45.14% probability that the point estimate was within ±15 of the population mean

3 0

3 years ago

A regular hexagon is drawn inside of a circle so that each of its vertices touches the circle. the diameter of the circle is 4 c

LenKa [72]

The length of the circumference is (being $d$ the diameter, and using 3.14 for $\pi$ ):

$L = 2 \cdot r \cdot \pi = d \cdot \pi = 4 \cdot \pi \text{ cm} = 12.56 \text{ cm}$

The perimeter of the hexagon is 12 cm.

Hence, the circumference is 0.56 cm longer than the perimeter of the hexagon.

5 0

3 years ago

PLEASE DOES ANYONE KNOW THE ANSWER TO THIS QUESTION?

zzz [600]

I believe the answer you are looking for is 24%

3 0

3 years ago

Please help me i'll give brainliest

Illusion [34]

Answer:

Step-by-step explanation:

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3 years ago

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