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2 years ago

When is the slope intercept form only y= mx and not y = mx+b?

Mathematics

1 answer:

snow_lady [41]2 years ago

5 0

Answer:

No Y-Intercept

Step-by-step explanation:

The only way for a slope to never have B within itself, is when Slope intercept form has no value for B or the Y intercept.

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If the coefficient of determination is 0.25 and the sum of squares residual is 180, then what is the value of SSY?

Gennadij [26K]

Answer:

And then $SSY=SS_{total}=\sum_{j=1}^n (y_j-\bar y)^2 =240$

C. 240

Step-by-step explanation:

Previous concepts

Analysis of variance (ANOVA) "is used to analyze the differences among group means in a sample".

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.

If we assume that we have $k$ independent variables and we have $j=1,\dots,j$ individuals, we can define the following formulas of variation:

$SS_{total}=\sum_{j=1}^n (y_j-\bar y)^2$

$SS_{regression}=SS_{model}=\sum_{j=1}^n (\hat y_{j}-\bar y)^2$

$SS_{error}=\sum_{j=1}^n (y_{j}-\hat y_j)^2 =180$

And we have this property

$SST==SSY=SS_{regression}+SS_{error}=SSR+180$

If we solve for SSR we got:

$SSR= SSY-180$ (1)

And we know that the determination coefficient is given by:

$R^2 = \frac{SSR}{SSY}$

We know the value os $R^2= 0.25$ and we can replace SSR in terms of SSY with the equation (1)

$R^2 =0.25= \frac{SSY-180}{SSY}= 1-\frac{180}{SSY}$

And solving SSY we got:

$\frac{180}{SSY}=1-0.25=0.75$

$SSY= \frac{180}{0.75}=240$

And then $SSY=SS_{total}=\sum_{j=1}^n (y_j-\bar y)^2 =240$

C. 240

7 0

3 years ago

Tina pet sits to earn extra money. She charges a flat service fee of $20, plus $15 per day. If one of her customers spent less t

Tems11 [23]

Answer:

D. $15x+20<$110

Step-by-step explanation:

$15 times the number of days plus the service fee should be less than $110.

4 0

3 years ago

Andy canoe is 2.7 meters long. how long would it be in milliters?

3241004551 [841]

A meter is 1000 millimeters.

Multiply 2.7 by 1000.

2.7 * 1000 = 2700

7 0

3 years ago

(33) Please check my answer in geo thanks<br><br> I am not 100% about this one

Reil [10]

Yes this is using the transitive property
Point A leads to point B, B goes to C, so overall A goes to C. Think of it connecting a chain.

Nice job on getting the correct answer.

5 0

3 years ago

IF YOU ARE UNSURE PLEASE DO NOT ANSWER!!! According to the graph, how long would it take to travel 26 miles?

tatyana61 [14]

It is a. i am sure the answer is a

7 0

3 years ago