If a have calculated 2 standard deviations from a sample of for example 25 day duration in a hospital for 2 groups ( 1 group was given antibiotics , the other group was not given the antibiotics)

The standard deviation for group given antibiotic was 8.23 and the standard deviation for group not given the antibiotic was 3.59

what is the trend..what can be said about the 2 groups:
answer...the group given the antibiotic stayed longer in the hospital

WHY??????how do i know