4 years ago

Help with the bottom? thanks ♡

Mathematics

1 answer:

Serggg [28]4 years ago

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2. x³ + 8x + 13
3. 8x + 5
4. 3x² + 2x +4
5. 2x³ + 5x
6. 2x³ - 2x - 6

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Step-by-step explanation:

Given : Total number of students who are asked to complete a survey anonymously : n= 240

Number of students

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Significance interval : $\alpha=1-0.95=0.05$

Critical value : $z_{\alpha/2}=1.96$

The confidence interval for the true proportion is given by :-

$p\pm z_{\alpha/2}\sqrt{\dfrac{p(1-p)}{n}}\\\\=0.225\pm (1.96)\sqrt{\dfrac{(0.225)(1-0.225)}{240}}\\\\\approx0.225\pm0.0528\\\\=(0.255-0.528,\ 0.255+0.528)\\\\=(0.273,\ 0.783)$

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