3 years ago

Help me I don't know this answer

Mathematics

2 answers:

melamori03 [73]3 years ago

5 0

It is b because when you do that it is right

fomenos3 years ago

5 0

I think it A but i wouldn't trust me i

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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

slava [35]

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

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

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

Given : Margin of error : E= 0.05

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,

$n=270.6025\approx271$

Hence, the required minimum sample size =271

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4 years ago

Which is better to buy 12 bars of soap for $10.00 or 5 bars of soap for $4.00 is better which one

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Answer:

5 bars for $4.00

Step-by-step explanation:

10 / 12 = 0.833 repeating

4 / 5 = 0.8

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Which of the following is a correct interpretation of the expression -4 + 13? A. the number that is 4 to the left of -13 on the

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The answer is D the number that is 13 to the right of -4 on the number line.

Step-by-step explanation:

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4 years ago

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