The graph shows the costs of two types of fruit at a store. A graph measuring cost and amount. Two lines, labeled Cherries and A
pples, exit the origin to show that cost increases as amount increases Drag and drop the appropriate symbol to the box to compare the rates of the fruits. cost of apples per lb Response area cost of cherries per lb
1 answer:
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Answer:
And rounded up we have that n=656
Step-by-step explanation:
In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 80% of confidence, our significance level would be given by and
. And the critical value would be given by:
Solution to the problem
The margin of error for the proportion interval is given by this formula:
(a)
Since we don't have prior info for the proportion of interest we can use as estimator. And on this case we have that
and we are interested in order to find the value of n, if we solve n from equation (a) we got:
(b)
And replacing into equation (b) the values from part a we got:
And rounded up we have that n=656