Mann-Whitneyr U-Test USE THE 7 STEPS OF TESTING THE HYPOTHESIS Make an analysis of the situation below using the appropriate statistical tool. 1. The following data represent the number of hours that two different types of machines operate in the la oratory before a next patient is entertained. Machine A 5.5 5.6 6.3 4.6 5.3 5.0 6.2 5.8 5.1 Machine B 3.8 4.8 4.3 4.2 4.0 4.9 4.5 5.2 4.5 Use a = 0.01 to determine if machine A operates longer than machine B on a full operation