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Answer:
The minimum sample size is needed to be 90% confident that the sample mean is within 1 day of the true population mean is 25.
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 size of the sample.
If the population standard deviation is 3 days, what minimum sample size is needed to be 90% confident that the sample mean is within 1 day of the true population mean?
This is n when . So
Rouding up to the nearest integer, 25.
The minimum sample size is needed to be 90% confident that the sample mean is within 1 day of the true population mean is 25.
Answer:
<h2>Step-by-step explanation:
v = u + at
To solve for t move u to the left side of the equation
That's
at = v - u
Divide both sides by a in order to make t stand alone
We have
<h3>We have the final answer as
<h3>Hope this helps and