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2 years ago

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Which of the purchases would be the least expensive? Purchase Amount of sale Sales tax rate A $150 5% B $145 7% C $140 8% D $135

9% purchase A purchase B purchase C purchase D

2 answers:

Lera25 [3.4K]2 years ago

8 0

Answer:

It is d

Step-by-step explanation:

:)

vivado [14]2 years ago

6 0

Answer:

It is D

Step-by-step explanation:

Just took the test on edg

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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 $F=\frac{MSR}{MSE}=$

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2 years ago

Simplify the expression: -7d+5(10d+-6)

Alexandra [31]

Answer:

-7d+50d+-30= 43d+-30

Use distributive property when there is parentheses and a number infront.
combine like terms. ONLY if they have the same variable.
then just put them in an expression.

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2 years ago

FromTheMoon [43]

The formula is A= 4(pi)r*squared* 201.06

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2 years ago

Julie has 5 times as many red beads as green beads. She has half as many yellow beads as red beads. She has 12 green beads.

ANEK [815]

12 green beads
60 red beads
30 yellow beads.
102 beads in all.

I hope this helped:)

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2 years ago

Which of the following equations is linear?

scoundrel [369]

Answer:

D

Step-by-step explanation:

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2 years ago