1. Sample Size and Confidence Interval

2. When I cover the entire population I get to know the truth – precisely.
That means that when my sample size is high I get a more precise answer.
That means that when my sample size increases my preciseness increases
That means that when my sample size increases my confidence interval becomes smaller

3. Alpha, Confidence Level and Confidence Interval

4. Confidence level
.95 or 95%
Alpha
.05
Alpha
.01
Confidence level
.99 or 99%

5. Confidence level
Confidence Interval
I am less confident of throwing
inside the inner rings which represent small interval
(think: confidence interval)
I am more confident of throwing a dart any
where on this dartboard which represents bigger interval
(think: high confidence interval).
Implies that I have higher confidence in making in
the higher confidence interval

6. Alpha
.05
Confidence level
.95 or 95%
Confidence interval