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Answer:
We need a sample size of at least 75.
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.
The standard deviation is the square root of the variance. So:
With a .95 probability, the sample size that needs to be taken if the desired margin of error is 5 or less is
We need a sample size of at least n, in which n is found when M = 5. So
We need a sample size of at least 75.
The equivalent expression to2-1/y/3+1/y is
Equivalent expressions are expressions does not look the same but when a value is being replaced with their variable, they end up giving the same result.
From the information given:
We have are to determine the equivalent expression to:
So if we multiply both the numerator and the denominator with 1/y, we have:
Learn more about equivalent expressions here:
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