A study compared tooth health and periodontal damage in a group of 40 young adult males with a tongue piercing and a control group of 50 young adult males without tongue piercing. Here are the summary statistics:
Group
Sample size
Mean of enamel cracks
StDev of enamel cracks
Tongue piercing
40
4.1
3.7
No Tongue piercing
50
1.3
1.6
State the null and alternative hypotheses:
Give the test statistic:
Find the p-value:
Decision and Conclusion:
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