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xxTIMURxx [149]

3 years ago

10

There are 150 students in the band and 90 students in the chorus. One half of the band members and 4/5 of the chorus members par

ticipated in a charity concert. How many more band members than chorus members participated in the concert?

1 answer:

Anit [1.1K]3 years ago

4 0

150 x 1/2 = 75
90 x 4/5 = 72

3 members

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What is 36.993 to the nearest thousandth

finlep [7]

The next larger thousandth is 36.994 .
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Which is equal to (2x − 3y + 5z) − (−4x − y + 8z)?

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(2x - 3y + 5z) - (-4x - y + 8z)
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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%

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 :-

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Hence, the required sample size would be 1067 .

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2 years ago

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azamat

Answer:

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