In 2022, the average number of hours people spent on social media per week was estimated to be 7.1 hours. A researcher wants to investigate whether this average has increased since 2022. For a random sample of 50 individuals, the mean number of hours spent on social media per week was calculated to be 8.4 hours with a sample standard deviation of 3.1 hours. What would be the test statistic for this hypothesis test?
a. 2.9653
B. 0.0001
C. 0.0023
D. 0.4194