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2 years ago

A wheel has a diameter of cm.How many revolutions does it make to cover 154m?

Mathematics

1 answer:

SCORPION-xisa [38]2 years ago

8 0

Answer:

154<em>divided</em><em> </em><em>by</em><em> </em><em>tounsend</em>

Step-by-step explanation:

second convert 154into mettres

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2 years ago

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2 years ago

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Step-by-step explanation:

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2 years ago

A researcher wishes to be 95% confident that her estimate of the true proportion of individuals who travel overseas is within 3%

andre [41]

Answer: a) 683 b) 1067

Step-by-step explanation:

The confidence interval for population proportion is given by :-

$p\pm z_{\alpha/2}\sqrt{\dfrac{p(1-p)}{n}}$

a) Given : Significance level : $\alpha=1-0.95=0.05$

Critical value : $z_{\alpha/2}}=\pm1.96$

Margin of error : $E=0.03$

Formula to calculate the sample size needed for interval estimate of population proportion :-

$n=p(1-p)(\dfrac{z_{\alpha/2}}{E})^2\\\\=0.2(0.8)(\dfrac{1.96}{0.03})^2=682.951111111\approx683$

Hence, the required sample size would be 683 .

b) If no estimate of the sample proportion is available then the formula to calculate sample size will be :-

$n=0.25(\dfrac{z_{\alpha/2}}{E})^2\\\\=0.25(\dfrac{1.96}{0.03})^2=1067.11111111\approx1067$

Hence, the required sample size would be 1067 .

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3 years ago

425÷5?<br> What's the answer

horrorfan [7]

Answer:

<h3>425÷5 = 85</h3><h3>I hope it helps. ❣❣</h3>

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2 years ago

A wheel has a diameter of cm.How many revolutions does it make to cover 154m?​

A wheel has a diameter of cm.How many revolutions does it make to cover 154m?