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2 years ago

How many feet are there in 23 yards? answer without units.

Mathematics

2 answers:

sesenic [268]2 years ago

5 0

Answer:

69 :)

Step-by-step explanation:

Tamiku [17]2 years ago

3 0

Answer: 69 feet

Step-by-step explanation:

1 yard= 3 feet

Given

There are 23 yards

Calculate

23 yards × 3 feet/yard= 69 feet

Hope this helps!! :)

Please let me know if you have any questions

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There are 18 women and 20 men in a room. Of the women, 10 are older than 35 years old. Of the men, 9 are older than 35 years old

Vinvika [58]

Answer: 50%

Step 1 add 18+20 = 38

Step 2 add 10+9= 19

Step 3 divide 19 by 38 = 2

So if would be half which is equal to 50%

7 0

3 years ago

In a one-way ANOVA, what is the difference between the among-groups variance MSA and the within-groups variance MSW?

LuckyWell [14K]

Answer:

$MSR=MSA=\frac{SSR}{k-1}$

And $MSE=MSW=\frac{SSE}{N-k}$

The difference is that MSA takes incount the variation between the groups and the grand mean, and the MSW takes in count the variation within groups respect to the mean of each group .

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 $j$ groups and on each group from $j=1,\dots,j$ 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

$SST=SS_{between}+SS_{within}=6750+8000=14750$

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

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

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

We can find the $MSR=MSA=\frac{SSR}{k-1}$

And $MSE=MSW=\frac{SSE}{N-k}$

The difference is that MSA takes incount the variation between the groups and the grand mean, and the MSW takes in count the variation within groups respect to the mean of each group .

And the we can find the F statistic $F=\frac{MSR}{MSE}=$