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DaniilM [7]
3 years ago
13

Please please help me!!

Mathematics
2 answers:
Andreyy893 years ago
8 0
Answer:

x=3y+18
————
2

Explanation: Step by step
Liono4ka [1.6K]3 years ago
7 0
A is the correct answer
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If we wanted to create a new 90% confidence interval from a different sample for the proportion of those with a two on one date
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Answer: 271

Step-by-step explanation:

The formula we use to find the sample size is given by :-

n=p(1-p)(\dfrac{z_{\alpha/2}}{E})^2

, where z_{\alpha/2} is the two-tailed z-value for significance level of (\alpha)

p = prior estimation of the proportion

E = Margin of error.

If prior estimation of the proportion is unknown, then we take p= 0.5 , the formula becomes

n=0.5(1-0.5)(\dfrac{z_{\alpha/2}}{E})^2

n=0.25(\dfrac{z_{\alpha/2}}{E})^2

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Confidence level = 90%

Significance level \alpha=1-0.90=0.10

Using z-value table , Two-tailed z-value for significance level of 0.10

z_{\alpha/2}=1.645

Then, the required sample size would be :

n=0.25(\dfrac{1.645}{0.05})^2

Simplify,

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Hence, the required minimum sample size =271

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