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A study of peach trees found that the average number of peaches per tree was 625....

A study of peach trees found that the average number of peaches per tree was 625. The standard deviation of the population is 35 peaches per tree. A scientist wishes to find the 99% confidence interval for the mean number of peaches per tree. How many trees does she need to sample to obtain an average accurate to within 18 peaches per tree?

4

21

23

26
math   Statistics-And-Probability   
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Answer #1
for 99 % CI value of z= 2.576
standard deviation σ= 35
margin of error E = 18
required sample size n=(zσ/E)2                                         = 26.0

option 26 is correct

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