The Proper Conclusion
to a Significance Test
Luke Wilcox is an “acorn” at the 2013 AP Statistics
reading. After three days of scoring, his table
leader is worried that he is scoring the exam
questions too hard. The table leader takes a
simple random sample of 35 exam questions
that Luke has graded and calculates the
average score assigned is 1.96 with a standard
deviation of 1.12. The average score assigned
on this question is supposed to be 2.14.
Does the table leader have good evidence that
Luke is scoring the exam questions too hard?
The Proper Conclusion
The Proper Conclusion
Interpret P-value.
If P-value is small
strong evidence against Ho --> stat. sig. --> reject Ho -->
can conclude Ha (context)
If P-value is large
weak evidence against Ho --> not stat. sig. --> fail to reject
Ho --> cannot conclude Ha (context)