A premedical student at a university was complaining that she had just paid $158. 60 for her human anatomy book, including tax.
1 answer:
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Answer:
We need a sample size of 2,071,800 or higher.
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, we 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.
In this problem:
We need a sample size of n or higher, when . So
We need a sample size of 2,071,800 or higher.