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4 years ago

What's the ratio 20 to 36

Mathematics

1 answer:

inna [77]4 years ago

7 0

20:36 simplifies to 10:18 then to 5:6

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A researcher compares differences in positivity between participants in a low-, middle-, or upper-middle-class family. If she ob

777dan777 [17]

Answer:

(2, 12)

Step-by-step explanation:

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"

If we assume that we have $3$ groups and on each group from $j=1,\dots,n_j$ we have $n_j$ individuals on each group we can define the following formulas of variation:

$SS_{total}=\sum_{j=1}^p \sum_{i=1}^{n_j} (x_{ij}-\bar x)^2$

$SS_{between=Treatment}=SS_{model}=\sum_{j=1}^p n_j (\bar x_{j}-\bar x)^2$

$SS_{within}=SS_{error}=\sum_{j=1}^p \sum_{i=1}^{n_j} (x_{ij}-\bar x_j)^2$

And we have this property

$SST=SS_{between}+SS_{within}$

The degrees of freedom for the numerator on this case is given by $df_{num}=k-1=3-1=2$ where k =3 represent the number of groups.

The degrees of freedom for the denominator on this case is given by $df_{den}=df_{between}=N-K=15-3=12$ .

And the total degrees of freedom would be $df=N-1=15 -1 =14$

And the correct answer would be 2 degrees of freedom for the numerator and 12 for the denominator

(2, 12)

3 0

3 years ago

A month of the year is chosen at random. What is the probability that the month starts with the letter J or the letter M?

SVETLANKA909090 [29]

Answer:

5/12 chance

Step-by-step explanation:

take the number of months that start with J and M over the number of months in the year.

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3 years ago

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kolbaska11 [484]

It's 3 vertices, hope this helps!

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3 years ago

I need help with one

Aleks04 [339]

Your goal here is to determine the value of x.

Use the principle of similar triangles:

x is to 12 as 6 is to 8:

x 6
--- = ----
12 8

Therefore, 8x = 72, and x = 9 (answer)

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3 years ago

Adimas found the mean of her 11 math test scores for the first semester. x = StartFraction (76 + 87 + 65 + 88 + 67 + 84 + 77 + 8

Lilit [14]

Answer:

71.36 and 8.45

Step-by-step explanation:

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3 years ago

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