What’s the diameter of the circle of the circumference is 30 pi inches
2 answers:
Answer:
Step-by-step explanation:
The circumference formula for a circle is
or
We'll use the second one since our problem wants us to find diameter. If we know that the circumference is 30π, then we will sub in 30π for C and solve for d:
30π = πd so
30π/π = d
The π's cancel out, leaving us with a diameter of 30 inches.
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Answer:
The minimum sample size required to create the specified confidence interval is 2229.
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.
What is the minimum sample size required to create the specified confidence interval
This is n when
Rounding up
The minimum sample size required to create the specified confidence interval is 2229.