Battery Life of Tablet Computers Is of Great Concern to Customers.A

Multiple Choice

Battery life of tablet computers is of great concern to customers.A consumer group has tested four brands of such tablets to determine the battery life.Samples of tablets of each brand were fully charged and left to run until the battery died.The number of hours that each tablet lasted was recorded.The following graphs and tables from the analysis of the data are provided.(Note: Some entries have been omitted and replaced with _**.) How many degrees of freedom are there for error (DFE) ,and what is the value of the MSE?

A) DFE = 51;MSE = 10.65
B) DFE = 49;MSE = 11.09
C) DFE = 51;MSE = 10.87
D) DFE = 50;MSE = 12.27
E) DFE = 50;MSE = 10.87