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2 years ago

HURRY 15 POINTS i need this sooooooooooooooon

Mathematics

2 answers:

navik [9.2K]2 years ago

7 0

Answer:

Its D

Step-by-step explanation:

$\frac{\left(x^6y^8\right)^3}{x^2y^2}$

$=\frac{x^{18}y^{24}}{x^2y^2}$

$=x^{16}y^{22}$

asambeis [7]2 years ago

4 0

Answer:

Step-by-step explanation:

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3 years ago

To express the polynomial d^2+d^3-d+3 in standard form, which term should be written first?

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3 years ago

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The revenue earned from a sporting event can be determined by the ticket price, $125 each.

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2 years ago

12 Times 12 = 144 right?

REY [17]

Answer:

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3 years ago

A researcher claims that the variation in the salaries of elementary school teachers is greater than the variation in the salari

guajiro [1.7K]

Answer:

The null hypothesis is $H_o : \sigma^2_1 = \sigma^2 _2$

The alternative hypothesis is $H_a : \sigma_1 ^2 > \sigma^2_2$

$F_{critical} = 1.8608$

$F = 2.9085$

The decision rule is

Reject the null hypothesis

There is sufficient evidence to support the researchers claim

Step-by-step explanation:

From the question we are told that

The first sample size is $n_1 = 30$

The sample variance for elementary school is $s^2_1 = 8324$

The second sample size is $n_2 = 30$

The sample variance for the secondary school is $s^2_2 = 2862$

The significance level is $\alpha = 0.05$

The null hypothesis is $H_o : \sigma^2_1 = \sigma^2 _2$

The alternative hypothesis is $H_a : \sigma_1 ^2 > \sigma^2_2$

Generally from the F statistics table the critical value of $\alpha = 0.05$ at first and second degree of freedom $df_1 = n_1 - 1 = 30 - 1 = 29$ and $df_2 = n_2 - 1 = 30 - 1 = 29$ is