Confidence Intervals

• Everyone take a 1-minute to explain a confidence interval to your grandma. In one minute, I will have you enter your answer on Slack.

Coin Flips and Confidence Intervals

• Coin Flip and probability Vs. Confidence Intervals
• What is the probability that I get heads?
• I flipped, what is the probability I have a head?
• How many heads will we have if we flip the coin ten times?

Understanding Confidence Intervals

Confidence intervals are like coin flips, just that the probabilities move from 50-50 to 95-5.

• App to help us understand confidence intervals - You might try adjusting the sample size and observing the effect that has on the size of each interval.

• Point Estimators Vs. Parameters: Discuss the WHO child heights data.
  • Point Estimators: Sample mean
  • Parameters: Population mean
• Interval Estimators: Why do we need interval estimators?

Comparing Proportional Measures

• Moving from the idea of the Matthew effect to measuring the Matthew effect.
• How could we use a proportion test to test if the Matthew effect is real?
• What are our Null and Alternative hypotheses?
• How else could we set up the comparison?

Data time