28. The fo l lowin g ta b le s h ow s th e annual returns (in percent ) for Fidelity's Electronic and Utilities funds .

Year Electronic U t ilit ie s 2005 13.23 9.36 2006 1.97 32.33 2007 2.77 21.03 2008 − 50.00 − 35.21 2009 81.65 14.71 Source: w w w . f in a n c e .y a h o o .c o m .

Using th e critical v a lue approach, t e s t if th e pop ula t ion variances dif fer at th e 5% s igni f icance level. State your a s sump t io n s .