Montgomery, Peck, and Vining (2001) report on a study in which a rocket motor is formed by binding an igniter propellant and a sustainer propellant together inside a metal housing. The shear strength of the bond between the two propellant types is an important characteristic. Results of testing 20 randomly selected motors are shown in the following table. Test the hypothesis that the median shear strength is 2000 psi using the Wilcoxon Signed-Rank Test.
|
Observation
|
Shear Strength, psi
|
|
1
|
2458
|
|
2
|
2390
|
|
3
|
2478
|
|
4
|
1497
|
|
5
|
2135
|
|
6
|
2379
|
|
7
|
1963
|
|
8
|
2070
|
|
9
|
2699
|
|
10
|
2191
|
|
11
|
2208
|
|
12
|
2123
|
|
13
|
1663
|
|
14
|
2042
|
|
15
|
2081
|
|
16
|
2045
|
|
17
|
2460
|
|
18
|
1745
|
|
19
|
1970
|
|
20
|
1719
|