Suppose a researcher is interested in determining if there is a relationship between low birth weight and pediatric pneumonia. in order to test this relationship, the researcher will use a σ=746 grams and a margin of error plus or minus 646 grams. how many newborns will the researcher need to sample in order to be 95% confident?

He will need 4 newborns in the sample to be 95% confident.

Step-by-step explanation:

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

Now, we have to find z in the Ztable as such z has a pvalue of .

So it is z with a pvalue of , so

Now, find the margin of error M as such

In which is the standard deviation of the population and n is the length of the sample.

So:

He will need 4 newborns in the sample to be 95% confident.

answer;

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answer: procent 54 wynosi 33,33%