1. Chap 10-11 Notecards

2. One sample mean (known σ) – Z Test Checks:SRS n<15 approx normal, no skew/outlier n<30 no clear outliers n≥30 OK! Hypothesis:H 0 : µ = µ o H a : µ ≠ µ o, µ µ o Conclusion: Is p <  ? Yes, REJECT H o No, Fail TO REJECT H o Find p ( don’t forget to double if two-tailed test) Test: Answer: In context !

3. Confidence Interval:

4. One sample mean (unknown σ) – t Test Checks:SRS n<15 approx normal, no skew/outlier n<30 no clear outliers n≥30 OK! H 0 : µ = µ o H a : µ = µ o, µ µ o  =.05 (unless given) Is p <  ? Yes, REJECT H o No, Fail TO REJECT H o Find p ( don’t forget to double if two-tailed test) df = n - 1

5. Use n-1 degrees of freedom when looking up t *

6. Type I and Type II Errors Type I Error – Reject H o (accept H a ) when in  fact H o is true Type II Error – Accept H o (reject H a ) when in  fact H a is true. Power – Test rejects H o when it should 1 – 