Question
A random sample of the price of gasoline from 40 gas stations in a region gives the statistics below. Complete parts a through c below.
A random sample of the price of gasoline from 40 gas stations in a region gives the statistics below. Complete parts a through c below.
y=$4.19, SE(y)=$0.02
a) Find a 95% confidence interval for the mean price of regular gasoline in that region.
b) Find the90% confidence interval for the mean.
c) If we had the same statistics from a sample of 80 stations, what would the95% confidence interval benow?
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Sample Size Determination In Clinical Trials With Multiple Endpoints
Authors: Takashi Sozu, Tomoyuki Sugimoto, Toshimitsu Hamasaki, Scott R Evans
1st Edition
3319220055, 9783319220055
