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2 years ago

Which expression is equivalent to?

Mathematics

1 answer:

Lapatulllka [165]2 years ago

6 0

Answer: 7x^3y^4z^2

Step-by-step explanation:

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Solve the proportion 7x + 1 9 = 2x 3

gayaneshka [121]

How this makes no sense i’m in middle school

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3 years ago

A poll finds that 54% of the 600 people polled favor the incumbent. Shortly after the poll is taken, it is disclosed that the in

Galina-37 [17]

Answer:

The value of z test statistics is 1.561.

Step-by-step explanation:

We are given that a poll finds that 54% of the 600 people polled favor the incumbent.

Shortly after the poll is taken, it is disclosed that the incumbent had an extramarital affair. A new poll finds that 50% of the 1030 polled now favor the incumbent.

Let $p_1$ = population proportion of people who favor the incumbent in the first poll

$p_2$ = population proportion of people who favor the incumbent in the second poll

So, Null Hypothesis, $H_0$ : $p_1\geq p_2$ {means that his support has increased or remained same after the second poll}

Alternate Hypothesis, $H_0$ : $p_1 < p_2$ {means that his support has decreased after the second poll}

The test statistics that would be used here is Two-sample z test for proportions;

T.S. = $\frac{(\hat p_1-\hat p_2)-(p_1-p_2)}{\sqrt{\frac{\hat p_1(1-\hat p_1)}{n_1}+\frac{\hat p_2(1-\hat p_2)}{n_2} } }$ ~ N(0,1)

where, $\hat p_1$ = sample proportion of people who favor the incumbent in first poll = 54%

$\hat p_1$ = sample proportion of people who favor the incumbent in second poll = 50%

$n_1$ = sample of people in first poll = 600

$n_2$ = sample of people in second poll = 1030

So, the test statistics = $\frac{(0.54-0.50)-(0)}{\sqrt{\frac{0.54(1-0.54)}{600}+\frac{0.50(1-0.50)}{1030} } }$

= 1.561

Hence, the value of z test statistics is 1.561.

6 0

3 years ago

Can someone please tell me the ans of question no. 5, 7 and 12

uysha [10]

Step-by-step explanation:

Z²=x³

Z²=9³

Z= √9³

Z= 27

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3 years ago

After you complete your survey of students reported heights at your school, you discover that your sample is biased. Exactly 10%

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What we can say with a good deal of certainty is that our sample is biased towards the higher spectrum and that the real value of the mean for our population is lower than the obtained value of our sample. If this is true, we should expect for the standard deviation to be higher than in the population.

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3 years ago

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In matrix theory, many of the familiar properties of the real number system are not valid. If a and b are real numbers, then ab

kozerog [31]

Answer:

B= $\left[\begin{array}{ccc}0&0\\0&1\\\end{array}\right]$