Question

Victoria wants to estimate the mean weight of apples in her orchard. She'll sample m apples...

Victoria wants to estimate the mean weight of apples in her orchard. She'll sample m apples and make a 95% confidence interval for the mean weight. She is willing to use o = 15 grams as an estimate of the standard deviation, and she wants the margin of error to be no more than 5 grams.
Which of these is the smallest approximate samole soze required to obtain the desired margin of error?
Choose 1 answer;
A. 5 apples
B. 15 apples
C. 25 apples
D. 30 apples
E. 35 apples
Math   Statistics-And-Probability   
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Answer #1

We have given here,              
              
Population standard deviation =   15 grams
Margin of error =E=5 grams
Level of significance =   1-0.95=0.05
Z critical value is (by using Z table)=   1.96
Sample size formula is               


=34.57      

E. 35 apples
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