4.1.3. Item analysis
Corrected item total correlations, mean and standard deviations of the items, t-test among upper
and lower 27% groups were given in Table 6. Corrected item-total correlations ranged from .56 to
.91. These values demonstrated that the discrimination level of the items were high. The value of t-
test of upper and lower 27% groups ranged as 9.51 and 13.78 and found to be statistically
significant at the level of .01. Mean scores of the items ranged from 3.58 to 4.47 which showed a
high confidence of the teachers on TPACK items.