Homework Answers
Answer
We know that range is equal to difference of maximum value and minimum value
Using range rule of thumb for standard deviation = (range)/4
we have range = 100, so standard deviation = 100/4 = 25
Margin of error = 3
We have to find the sample size n for 95% confidence level
z score for 95% confidence level is 1.96 (using z distribution table)
Using the formula for n
we can write 
setting the given values, we get
rounding it off to next whole number, we get
sample size n = 267
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