For test of hypothesis, questions include

,Ho, Ha, Test statistic, P-Value and Conclusion

Q3)A magazine reports the average amount of wireless data used by teenagers each month is 10 Gb. Ella claims that the mean among teenagers in her area is less. She collects data from 40 teenagers and calculates a mean of 9.8 Gb with a standard deviation of 2.7 Gb per month. Test Ella's claim at the .01 significance level.

Can someone please help me break this down and provide TI84 Calculator commands?