Plot of residuals from a regression

Assignment Help Basic Statistics

Reference no: EM137964

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?

1087_Normal plot of residuals from a regression.jpg

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.

Reference no: EM137964

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