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3 years ago

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A college class had 22 men and 14 women. Which other class has the same ratio of men to women?

1 answer:

marshall27 [118]3 years ago

6 0

Answer:

C-A class with 32 and 24 woman

Step-by-step explanation:

A college class had 22 men and 14 women. Which other class has the same ratio of men to women?

Original-22-14=8 (8)

A-40-18=22 (22)

22 does not equal 8.

B-33-21=12 (12)

12 does not equal 8.

C-32-24=8 (8)

8 does equal 8.

D-11-6=5 (5)

5 does not equal 8.

<u><em>C has the same ratio because as you see men-woman=8 is the answer for both. Hence C is your answer.</em></u>

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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

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Answer:

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Step-by-step explanation:

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Hope this helps!

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