6 A random sample of 67 lab rats are enticed to run through

(6) A random sample of 67 lab rats are enticed to run through a maze, and a 90% confidence interval is constructed of the mean time it takes these 67 rats to complete the maze. Specifically we obtain (2.3min, 3.1min) as the 90% confidence interval.

(b) What is the margin of error for this interval ? [ Report the numerical value up to 1 decimal place ]

Mean time =( lower limit + upper limit)/2 = (2.3+3.1)/2=2.7