1. For small samples, t intervals are ___________ z intervals based on the same data set.
A. narrower than
B. the same as
C. wider than
2. I took a sample of the grade point averages for students in my class. For 25 students, the standard deviation of grade points was 0.65 and the mean was 2.89. The standard error for the sample was
A. 0.578.
B. 0.026.
C. 0.13.
3. I took a sample of the grade point averages for students in my class. For 25 students, the standard deviation of grade points was 0.65 and the mean was 2.89. A 95% confidence interval for the average grade point average for all students in my class is
A. (2.64, 3.14)
B. (2.62, 3.16)
C. (2.53, 3.25)