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4 years ago

Help help help! Im stuck please help!

Mathematics

1 answer:

ioda4 years ago

8 0

Answer:

1) 8/15

Step-by-step explanation:

When dividing by a number, multiply by its reciprocal.

2/5 ÷ 3/4

2/5 × 4/3

8/15

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3 years ago

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

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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 : $E=0.03$

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

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

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Hence, the required sample size would be 1067 .

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3 years ago

The pro shop at the Live Oak Country Club ordered two brands of golf balls. Par One balls cost $2.00 each and the Pro Sport ball

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If an equal number of each brand was ordered, how many dozens of each brand were ordered?

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