E-trust. Online retailers want customers to trust their websites and want to alleviate any concerns potential cus- tomers may have about privacy and security. In a study investigating the factors that affect e-trust, participants were randomly assigned to carry out online transactions
|
Source
|
DF
|
Sum of Squares
|
Mean Square
|
F-ratio
|
P-value
|
|
ISO 9000
|
1
|
2654.4
|
2654.41
|
5.78
|
0.022
|
|
Size
|
1
|
0.2
|
0.18
|
0.004
|
0.984
|
|
Interaction
|
1
|
1505.5
|
1505.49
|
3.28
|
0.079
|
|
Error
|
36
|
16545.9
|
459.61
|
|
|
|
Total
|
39
|
20705.9
|
|
|
|
a) Is this an experiment or an observational study?
b) State the hypotheses.
c) Given the small P-value associated with the ISO 9000 factor and that the mean annual return for the companies with ISO 9000 is 30.7% compared to 14.4% for those without, the auditors state that achieving ISO 9000 certifi- cation results in higher stock prices. Do you agree with their statement? Explain.