Using the curve of best fit, what would be the output (y) when the input (x) is 7?
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Answer:
A sample size of 35 is needed.
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 width W as such
In which is the standard deviation of the population and n is the size of the sample.
How large must the sample size be if the width of the 95% interval for mu is to be 1.0:
We need to find n for which W = 1.
We have that , then
. So
Rounding up
A sample size of 35 is needed.