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tino4ka555 [31]

3 years ago

13

-3 5/8 in rational form

1 answer:

LuckyWell [14K]3 years ago

8 0

Well you cannot write it in rational form, since it already is.

Rational form means a fraction. And -3 5/8 is a fraction..

Please correct me if I am wrong.

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If you want to be 95% confident of estimating the population mean to within a sampling error of plus or minus3 and the standard

Aleksandr [31]

Answer:

The sample size required is at least 171

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

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Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.025 = 0.975$ , so $z = 1.96$

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In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

What sample size is required?

A samle size of at least n is required, in which n is found when $M = 3, \sigma = 20$

So

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Rouding up

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