Julie knows that the adult population gets, on average, eight hours of sleep each night. a hypothesis test can help her see if college students are different from the adult population. julie tabulated that her sample of 101 students got an average of 7.1 hours of sleep each night, with a standard deviation of 2.48. using the data provided and the formula below, what is the t-statistic that julie calculates? answer choices are rounded to the hundredths place. t equals fraction numerator x with bar on top minus mu over denominator begin display style fraction numerator s over denominator square root of n end fraction end style end fraction a.) -0.24 b.) 6.78 c.) -3.64 d.) 2.61