Question

Super Sneaker Company is evaluating two different materials, A and B, to be used to construct the soles of their new active shoe targeted to city high school students in Canada. While material B costs less than material A, the company suspects that mean wear for material B is greater than mean wear for material A. Two study designs were initially developed to test this suspicion. In both designs, Halifax was chosen as a representative city of the targeted market. In Study Design 1, 14 high school students were drawn at random from the Halifax School District database. After obtaining their shoe sizes, the company manufactured 14 pairs of shoes, each pair with one shoe having a sole constructed from material A and the other shoe, a sole constructed from material B.

After 3 months, the amount of wear in each shoe was recorded in standardized units as follows:

	1	2	3	4	5	6	7	8	9	10	11	12	13	14
A	15.69	10.91	8.64	13.14	9.66	9.28	11.52	11.32	14.42	8.94	10.02	15.16	11.89	10.94
B	12.96	13.47	11.81	11.06	13.87	12.23	10.63	12.78	12.74	11.54	10.21	9.18	15.72	11.39

Answer 1

Let the group A be 2 and group B be 1. This study can be tested using a Paired t-test as observation are tied to one person, with D_i = B_i-A_i.

Data:

df = n-1

= 13

p-value = 0.2393 > 0.05 i.e. we fail to reject H₀ and hence we can't claim that mean wear for material B is greater than mean wear for material A.

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