1. Tests of Significance
Section 10.2

2. Test of Significance
Used to assess the evidence provided by data about some claim concerning a population

3. Null Hypothesis H0
Says there is no effect or no change in the population

4. Alternative HypothesisHa
Describes the alternative to the null hypothesis
Uses the wording of the problem

5. P-value
The probability under the normal curve to the right of the observed x bar.
Small P-values are evidence against H0
Large P-values fail to give evidence against H0

6. Significance Level 
Used to determine if results are statistically significant
Rule of thumb – statistically significant if P-value is less than .05

7. Significance Test
Identify population of interest and parameter to draw conclusions from.
State null and alternative hypotheses (use words and symbols)

8. Choose inference procedure, verify conditions
If conditions are met, calculate test statistic and find P-value
Interpret results in context of problem

9. Practice Problems
pg. 583 #