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. (e) What is the sample mean? [ Report the numerical value up to 1 decimal place ]

Solution

E)

mean = (lower bound + upper bound)/2

= (2.3 + 3.1)/2

= 2.7 [ANSWER]