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3 years ago

I don't understand! help please!!!

Mathematics

1 answer:

Lina20 [59]3 years ago

7 0

Answer:

try leaving and coming back to it

Step-by-step explanation:

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Calculating the degrees of freedom, the sample variance, and the estimated standard error for evaluations using the t statistic

Yuliya22 [10]

Answer:

a) For the first part we have a sample of n =10 and we want to find the degrees of freedom, and we can use the following formula:

$df = n-1= 10-1=9$

d.9

b) $s^2 = \frac{SS}{n-1}= \frac{600}{41-1}= 15$

a.15

c) For this case we have the sample size n = 25 and the sample variance is $s^2 =400$ , the standard error can founded with this formula:

$SE = \frac{s^2}{\sqrt{n}}= \frac{400}{\sqrt{25}}= 80$

Step-by-step explanation:

Part a

For the first part we have a sample of n =10 and we want to find the degrees of freedom, and we can use the following formula:

$df = n-1= 10-1=9$

d.9

Part b

From a sample we know that n=41 and SS= 600, where SS represent the sum of quares given by:

$SS = \sum_{i=1}^n (X_i -\bar X)^2$

And the sample variance for this case can be calculated from this formula:

$s^2 = \frac{SS}{n-1}= \frac{600}{41-1}= 15$

a.15

Part c

For this case we have the sample size n = 25 and the sample variance is $s^2 =400$ , the standard error can founded with this formula:

$SE = \frac{s^2}{\sqrt{n}}= \frac{400}{\sqrt{25}}= 80$

8 0

3 years ago

Ivanna has to carry 308 apples from a farm to the market. How many baskets will she need, given that each basket

Arisa [49]

Answer: I would say 9 baskets

Step-by-step explanation: if you divide 308 by 36, it would be 8.55. Logically speaking, you can’t have 8.5 baskets. So 9 it is.

7 0

3 years ago

<img src="https://tex.z-dn.net/?f=integrate%20%5C%3A%20%20ln%28x%29%20" id="TexFormula1" title="integrate \: ln(x) " alt="integ

mars1129 [50]

Answer:

ln(x) = 1/x... It's a basic rule of Calculus.

3 0

2 years ago

The ratio of boys to girls in a class is 3:1. There are 36 students in the class. How many students are girls

eduard

Hi there!

Boys 3x

Girls x

Total 4x = 36

x=9

27 boys

9 girls

Hope you understand,

Have a nice day,

Wolfiex

6 0

3 years ago

Read 2 more answers

he diameters of red delicious apples of an orchard have a normal distribution with a mean of 3 inches and a standard deviation o

Allushta [10]

Answer: 0.8351

Step-by-step explanation:

Given :Mean : $\mu=\text{ 3 inches}$

Standard deviation : $\sigma =\text{ 0.5 inch}$

The formula for z -score :

$z=\dfrac{x-\mu}{\sigma}$

For x= 2.5 ,

$z=\dfrac{2.5-3}{0.5}=-1$

For x= 4.25 ,

$z=\dfrac{4.25-3}{0.5}=2.5$

The p-value = $P(-1$

$=0.9937903-0.1586553=0.835135\approx0.8351$

Hence, the probability of picking an apple with diameter between 2.5 and 4.25 inches =0.8351.

7 0

3 years ago

I don't understand! help please!!! ​

I don't understand! help please!!!