essors Student Main Question 4 9 The grade point averages (GPA) of 15 randomly selected college students are 2.3, 3.3, 2.6, 1.8, 0.2, 3.1, 4.0, 0.7, 2.3, 2.0, 3.1, 3.4, 1.3, 2.6, 2.6 1. The sample mean is i(Round to one decimal place) 2. The sample standard deviation is . (Round to one decimal place) 3. The sample size is g \" W'Tl 4. The degree of freedom for the Studentized version of the sample mean is g l 5. The point estimate for the mean GPA of ALL students at this college is [I l Ml 6. The t-value for a 99% condence interval is t = J 7. The Margin of error for a 99% condence interval for this sample is i(Round to one decimal place) 8. The 99 % condence interval estimate of the mean GPA of students at this college is (Round to one decimal place) 9. The sample size is needed in order to obtain a margin of error of no more than 0.5 is i (Must be a whole number)