2. Record the number of pins on the water. Be careful to not counts twice. There...
2. Record the number of pins on the water. Be careful to not counts twice. There were __71__ pins in the water and ___14__ pins on the soil (non-water points). 3. Calculate a sample proportion of points that are on water and a 90% confidence interval for the proportion of the Earth that is covered with water. 90% Confidence Interval ________________________
Homework Answers
n= 71 and x= 14
Standard error of proportion = 
MARGIN OF ERROR= Zc*SE= 1.65*0.047= 
= 0.078
90% confidence interval is
90% confidence interval is (0.119,0.275).
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