Can someone help me with this ASAP please?
1 answer:
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Answer:
The minimum sample size that we should consider is of 60 employees.
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.
We want our 99 percent confidence interval to have a margin of error of no more than plus or minus 2 minutes. What is the smallest sample size that we should consider?
We need to find n for which
So
Simplifying by 2
Rounding up
The minimum sample size that we should consider is of 60 employees.