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2 years ago

HELP PLSS

Mathematics

2 answers:

LiRa [457]2 years ago

8 0

<h2>Answer:</h2>

D 2c + 4c + c

<h2>Step-by-step explanation:</h2>

Collect Coefficients of like terms

$(2+4+1)\times c$

__________________________________________________

Calculate the sum or difference

$7c$

__________________________________________________

Determine true/false

$Determine\ whether\ 7c\ and\ 2c+4c+c\ are equivalent:$

$True$

<em>I hope this helps you</em>

<h3 />

ratelena [41]2 years ago

7 0

.Answer:
Choices A and D =7c
Explanation:
I’ve attached my work..

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Here we are required to construct the 95% confidence interval of the difference between two proportions

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$\hat{p}_1-\hat{p}_2\pm z^{*}\sqrt{\frac{\hat{p}_1\left (1-\hat{p}_1 \right )}{n_{1}}+\frac{\hat{p}_2\left (1-\hat{p}_2 \right )}{n_{2}}}$

Where:

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Plugging in the values, we have;

$\frac{34}{1679}- \frac{24}{1366} \pm 1.96 \times \sqrt{\frac{ \frac{34}{1679}\left (1- \frac{34}{1679}\right )}{1679}+\frac{\frac{24}{1366} \left (1-\frac{24}{1366} \right )}{1366}}$

Which gives;

-7.01135×10⁻³ < $\hat{p}_1-\hat{p}_2$ < 1.237.

At 95% confidence level, the difference between the proportion of freshmen using steroids in Illinois and the proportion of seniors using steroids in Illinois = -7.01135×10⁻³ < $\hat{p}_1-\hat{p}_2$ < 1.237.

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