iPad 18:40 31%) capa.mathstat.dal.ca Super Sneaker Company is evaluating two dif
ID: 3351096 • Letter: I
Question
iPad 18:40 31%) capa.mathstat.dal.ca 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. The researcher in charge of this design asked the company to randomly assign material A to the right shoe or to the left shoe, for each of the 14 pairs. Why? Incorrect Right shoe wear is always greater than left shoe wear. Incorrect Left shoe wear is always greater than right shoe wear Correct: Right shoe wear is generally different than left shoe wear. [1 pt(s)) You are correct. Your receipt no. is 155-4280 Previous Tries After 3 months, the amount of wear in each shoe was recorded in standardized units as follows: 10 11 12 1314 11.1318.51 7.26/9.73]7.82 7.618.848.74 110.437.438.02|10.84]9.05 |8.53 B10.36 10.63 9.72 9.31 10.85 9.95 9.07 10.26 10.23 9.57 8.85 8.28 11.879.49Explanation / Answer
Two-sample T for B vs A
N Mean StDev SE Mean
B 14 9.889 0.913 0.24
A 14 8.85 1.26 0.34
Difference = (B) - (A)
Estimate for difference: 1.036
90% CI for difference: (0.328, 1.744)
T-Test of difference = 0 (vs ): T-Value = 2.49 P-Value = 0.019 DF = 26
Both use Pooled StDev = 1.0985
90% confidence interval is
0.327581363 1.743847208Related Questions
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