Data analysis and discussion
Reliability and Validity of Questionnaire
There were 400 questionnaires distributed and 395 remained valid while 5 were left blank to be invalid. All three
variables – brand image, product knowledge and purchase intention – receive a Cronbach’s α value of 0.8963,
0.9109, and 0.9697, respectively, meaning that the questionnaire has a good reliability. Moreover, the
questionnaire was examined on its content and construct validity. Content validity represents the appropriateness
of the content of the scale. This research is based on previous literature and works as well as further validated by
experts, thus it can be deemed to have an acceptable level of content validity. This research adopted the Pearson
product-moment correlation to examine construct validity: convergent and discriminant. For the three constructs,
all of the p values between items attributed to same construct are less than the significance level of 0.05,
indicating the scale with high convergent validity. Likewise, all of the p values between items attributed to
different construct are large than the significance level of 0.05, representing the scale with high discriminant
validity.