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HecptyAura
30.12.2020 •
Mathematics
Someone help meh please:)
simplify the complex fraction -3/5 2 1/4
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Ответ:
=−1 7/20
(Decimal: -1.35)
Step-by-step explanation: Hope this helped, Happy new years!
Ответ:
We need an SRS of scores of at least 153.
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/0566/1400/9073f.png)
Now, find M as such
In which
is the standard deviation of the population and n is the size of the sample.
How large an SRS of scores must you choose?
This is at least n, in which n is found when
. So
Rounding to the next whole number, 153
We need an SRS of scores of at least 153.