using excel please help me solve!

One of the steps involved in the processing of corn flakes involves the toasting of the flakes. The data below records the corn flake thickness (mm) for four different toasting times (seconds). 20 sec 40 sec 60 sec 80 sec 1.6 1.7 2.0 1.0 0.6 1.6 1.2 0.7 0.7 0.8 0.7 0.3 1. 10 pts a) At the .05 level of significance, is there enough evidence to indicate a difference in the variances of the mean thickness of the corn flakes for these for the different toasting times? 1.5 pt. b) What is the p-value for this problem? What does it mean