10 (2 points) Listen Dr. Kai's research indicates that levels of stress in children may vary as a result of family size. In their sample, 18 children from families with greater than 8 members living under one roof reported a mean score of 10.22 (SD = 4.87) on a 12-pt scale for stress level. To determine whether there might be any difference, Dr. Kai compared this to a population (full US random sample with 5 or fewer household members) with a u of 11.2 on the same 12-pt scale for stress. What is Dr. Kai's t-statistic? Enter a value with 2 decimal places without any rounding, including the minus sign before the first whole number if applicable