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.

(c) What is the width of this interval ? [ Report the numerical value up to 1 decimal place ]

(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.

(d) What is the center of this interval ? [ Report the numerical value up to 1 decimal place ]   

(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

C. Width is 3.1-2.3=0.8

D. Center of this interval is (3.1+2.3)/2=2.7