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3 years ago

Someone Pleasee help!!!!

Mathematics

2 answers:

Nataly_w [17]3 years ago

5 0

Answer: try C

Step-by-step explanation:

siniylev [52]3 years ago

4 0

I guess u can try out c

You might be interested in

HELP ASAP PLEASE :)

Snowcat [4.5K]

Answer:

One-thirdx2y cm3

Step-by-step explanation:

Given the base is square.The base length is $x\ cm$ and height is $h\ cm$ .

The general formula of volume of a right pyramid having a square base is,

$V=\frac{lwh}{3}$ cube unit.

Here, $l=w=x$ and $h=y$ $cm$

substituting these into the formula, we get:

$V=\frac{xxy}{3}\\ V=\frac{x^2y}{3}$ $cm^3$

Thus the volume of right pyramid has a square base with an edge length of x cm and a height of y cm is One-thirdx2y cm3.

3 0

4 years ago

A regression and correlation analysis resulted in the following information regarding a dependent variable (y) and an independen

Sunny_sXe [5.5K]

Answer:

1) $\hat \beta_1 =\frac{466}{234}=1.991$

2) $\hat \beta_o = 18.89 -1.991 (9)=0.970$

3) $SSR= SST-SSE= 1434-505.98=928.02$

4) $r=\frac{466}{\sqrt{[234][\sum(1434]}}=0.804$

And the determination coeffecient is $r^2 = 0.804^2 =0.647$

Step-by-step explanation:

The correlation coefficient is a "statistical measure that calculates the strength of the relationship between the relative movements of two variables". It's denoted by r and its always between -1 and 1.

The sum of squares "is the sum of the square of variation, where variation is defined as the spread between each individual value and the grand mean"

When we conduct a multiple regression we want to know about the relationship between several independent or predictor variables and a dependent or criterion variable.

Data given

n=10 $\sum (x-\bar x)(y-\bar y) =466,\sum (x-\bar x)^2 =234 , \sum(y-\bar y)^2 =1434$

Part 1

The slope is given by this formula:

$\hat \beta_1 =\frac{\sum (x-\bar x) (y-\bar y)}{\sum (x-\bar x )^2}$

If we replace we got:

$\hat \beta_1 =\frac{466}{234}=1.991$

Part 2

We can find the intercept with the following formula

$\hat \beta_o = \bar y -\hat \beta_1 \bar x$

We can find the average for x and y like this:

$\bar X=90/10 = 9. \bar y= 170/9=18.89$

And replacing we got:

$\hat \beta_o = 18.89 -1.991 (9)=0.970$

Part 3

For this case we have the SSE=505.98 who represent the sum of squares for the error.

The total sum of squares is given by $SST \sum (y-\bar y)^2 = 1434$

And since the total variation is the sum of squares for the regression and the error we have this:

$SST= SSR+SSE$

And solving for SSR we got:

$SSR= SST-SSE= 1434-505.98=928.02$

Part 4

In order to calculate the correlation coefficient we can use this formula:

$r=\frac{\sum (x-\bar x)(y-\bar y) }{\sqrt{[\sum (x-\bar x)^2][\sum(y-\bar y)^2]}}$

For our case we have this:

n=10 $\sum (x-\bar x)(y-\bar y) =466,\sum (x-\bar x)^2 =234 , \sum(y-\bar y)^2 =1434$

So we can find the correlation coefficient replacing like this:

$r=\frac{466}{\sqrt{[234][\sum(1434]}}=0.804$

And the determination coeffecient is $r^2 = 0.804^2 =0.647$

4 0

4 years ago

Aiden is visiting the zoo on a field trip. While at the zoo, he sees a 10 foot tall adult elephant standing next to a 15 foot ta

bogdanovich [222]

Set up a ratio:

10 foot tall elephant / X shadow length = 15 foot tall statue / 18 foot shadow.

Cross multiply:

10 * 18 = X * 15

Simplify:

180 = 15x

Divide both sides by 15:

x = 180 / 15

x = 12

The elephants shadow was 12 feet long.

7 0

3 years ago

the total of 3/4 of a fifth grade class finished their work before recess exactly 3/4 of the students who finish before recess d

yaroslaw [1]

Answer:

This is not a question.

Step-by-step explanation:

7 0

3 years ago

If x = -5 and y = x + 4, what ordered pair represents the solution? A. (5, -1) B. (-5, -1) C. (5, 1) D. (4, 4)

tekilochka [14]

B.) would be correct
(x,y)
x=-5
y=x+4
y=(-5)+4
y=-1
(-5,-1)

3 0

4 years ago