For the statements in the “Teacher Textbook
Evaluation Scale ” a Likert-type of equal-range and six sections was
used. The statements in the inventory have been labelled as;
"Completely Agree (5)", "Agree (4)", "Partly Agree (3)", "Disagree
(2)", "Completely Disagree (1)". In order to test the reliability of the
“Teacher Textbook Evaluation Scale, both as a whole and each of
the six dimensions, the Cronbach Alpha Coefficients were
calculated. As a whole the “ Teacher Textbook Evaluation Scale ”
has a high degree of reliability ("a-0.9478").
Table 2 shows that when Alpha coefficient evaluation value
criteria are considered, “Teacher Textbook Evaluation Scale” has a
high degree of reliability as a whole. In group comparisons,
reliability values between 0.60 and 0.80 are acceptable.