20 points!!!

Mathematics

2 answers:

saw5 [17]3 years ago

7 0

Answer:

Step-by-step explanation:

8 is the answer for khan academy

Elanso [62]3 years ago

5 0

w^3 = 512

w = cubic root(512)

w = 8 centimeters

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Four girls helped Mr. Day plant a garden. For their help, he gave the girls $24 to share equally.later, mrs. day gave each girl

MatroZZZ [7]

First take note that Mr. Day gave them $24 to share and Mrs. Day gave each of them $2. There were also four girls in total.

So we'll divide 24 by 4 resulting each girl getting $6 each from Mr. Day.

Now we'll add the $2 Mrs. Day gave them resulting in the answer.

Each girl made $8 from Mr. and Mrs. Day

8 0

3 years ago

Read 2 more answers

Repeated student samples. Of all freshman at a large college, 16% made the dean’s list in the current year. As part of a class p

Dima020 [189]

Answer:

a) p-hat (sampling distribution of sample proportions)

b) Symmetric

c) σ=0.058

d) Standard error

e) If we increase the sample size from 40 to 90 students, the standard error becomes two thirds of the previous standard error (se=0.667).

Step-by-step explanation:

a) This distribution is called the sampling distribution of sample proportions (p-hat).

b) The shape of this distribution is expected to somewhat normal, symmetrical and centered around 16%.

This happens because the expected sample proportion is 0.16. Some samples will have a proportion over 0.16 and others below, but the most of them will be around the population mean. In other words, the sample proportions is a non-biased estimator of the population proportion.

c) The variability of this distribution, represented by the standard error, is:

$\sigma=\sqrt{p(1-p)/n}=\sqrt{0.16*0.84/40}=0.058$

d) The formal name is Standard error.

e) If we divided the variability of the distribution with sample size n=90 to the variability of the distribution with sample size n=40, we have:

$\frac{\sigma_{90}}{\sigma_{40}}=\frac{\sqrt{p(1-p)/n_{90}} }{\sqrt{p(1-p)/n_{40}}}}= \sqrt{\frac{1/n_{90}}{1/n_{40}}}=\sqrt{\frac{1/90}{1/40}}=\sqrt{0.444}= 0.667$