A recent study compare tooth health and periodontal damage in a group of 44 young adult males wearing a tongue piercing and a control group of 46 young adult meals without tongue piercing. One question of interest with whether individuals with tongue piercings had more name cracks on average. The summary statistics for the study is shown in the table below (note: not all information in the tables required to solve the problem; you must decide what pieces of information are necessary). Assume all conditions are met and the difference is defined as tongue piercing no tongue piercing. do you want to conduct a hypothesis test in order to determine if there is a difference between the two groups. What is the value of the test statistic?

how many degrees of freedom does this hypothesis test have?

Group ns Tongue Piercing 44 3.8 3.3 No Tongue Piercing 46 1.5 1.7 Difference 44 2.8 0.9