Jackson sampled 101 students and calculated an average of 6.5 hours of sleep each night with a standard deviation of 2.14. Using a 95% confidence level, he also found that t* = 1.984. confidence interval = A 95% confidence interval calculates that the average number of hours of sleep for hours. Answer choices are rounded to working college students is between the hundredths place. a.) 6.15 and 6.94 O b.) 6.46 and 6.54 c.) 6.08 and 6.92 dl 6 46 and 6.92