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asiaboo0
12.12.2019 •
Mathematics
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?
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Ответ:
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 ![z = 1.645](/tpl/images/0414/6645/9073f.png)
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.
Ответ:
lol on life?
Step-by-step explanation:
its 12:00 am sorry i can't