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3 years ago

1. 60 is increased to 67.

Mathematics

1 answer:

nadya68 [22]3 years ago

7 0

Answer:

what is the question?

Step-by-step explanation:

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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 :-

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

Hence, the required sample size would be 1067 .

3 0

3 years ago

bob and Cheryl are taking a road trip that is 189.80 miles. Bob drove 3/4 of the total distance.How many miles did Bob drive?

Tom [10]

142.35 miles. Just multiply 189.80 by 3/4 (or .75).

5 0

3 years ago

Draw stars and pentagons in the ratio 4 : 2.

Hoochie [10]

☆☆☆☆☆☆☆

Your stars

⬠⬠⬠⬠⬠⬠⬠⬠⬠⬠

And pentagons

( i cant put them at a ratio though sorry :< )

3 0

3 years ago

A candidate scored 40 marks out of 120 wat was the percentage of the score

andriy [413]

40/120 = 0.33 repeating
or 33%

6 0

4 years ago

If line q has a slope of -3/8 what is the slope of any line perpendicular to q?

kompoz [17]

Answer:

new slope = 4/3

Step-by-step explanation:

-3/8 is perpendicular to the new slope

=> new slope = -8/3 * -1/2

= 8/6

= 4/3

please give me brainliest if it is helpful for you

7 0

3 years ago