2.8. Data analysis
The results obtained from the measurements of the cookies were expressed as the mean, pooled standard deviation and coefficient of variation.
The significance of the applied model evaluated the effect of WPC and margarine addition on the cookie measurements
using the analysis of variance (F-test).
The entire model includes linear (L), quadratic (Q) and cross product terms.
The effect of each term and the statistical significance of the response variables were analyzed using a standardized Pareto chart.
Possible correlations were assessed using correlation coefficients (Pearson correlation).
The sensory analysis results were subjected to oneway analysis of variance (ANOVA) followed by the Tukey test.
The results from the analysis of the cookies during storage were compared using the Student's t-test.
For all assessments, a 95% confidence level was considered significant.
All statistical analyses were performed using Statistica 10.0 software (Statsoft Inc. e Tulsa, OK, USA).