In a study of tooth paste, 40 children used paste without fluoride resulting in a mean of 5.65 cavities with s1= XXXXXXXXXXchildren used paste with fluoride and this sample revealed mean of 4.75...

In a study of tooth paste, 40 children used paste without fluoride resulting in a mean of 5.65 cavities with s1=1.3 . 40 children used paste with fluoride and this sample revealed mean of 4.75 cavities with s2=1.1. Do these results indicate a significant difference between two groups? Perform two-sided test at 2% SL, give all steps of procedure, interpret obtained result in terms of given example.