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This homework will be due October 28 at 3am. This homework contains prediction/confidence
interval questions and material pertaining to (violations of) assumptions about the error term,
material that can be found on pages 7579 in your course packet. Note: there is an equivalent
version of the prediction and confidence interval formulas on your formula sheet compared to the
reader page 78 and 79 you may find more helpful on a few of the problems.
Question #1
It has been computed that the 95% confidence interval
is [144.4, 154.2] for the average exam
score when a student spent 10 hours on average per week studying for the class. The 90%
prediction interval
for a student who spent 10 hours on average per week studying for the class
will be
•
wider
•
cannot be determined based on the provided information.
•
narrower
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 Fall '08
 Petry

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