1. Below is a normal plot of residuals from a regression. Does the plot indicate any problems with the assumption that the residuals are Normally distributed?
A. There are no problems evident in the plot.
B. The residuals show some high outliers.
C. The residuals are not Normally distributed.
2. A regression was performed on a data set with 22 data points where we were investigating the relationship between a midterm score and the grade on the final exam. We obtained a correlation of 0.30. The t statistic for determining if the relationship is significant is
A. t = 1.48.
B. t = 1.41.
C. t = 1.60.
3. Confidence intervals for a mean response are narrowest where?
A. near the ends of the data
B. near the middle of the data
C. They are the same width throughout a data set.