Weds = Study Vocab + HW

1.) Tomorrow we will start class with a chapter 18 vocab quiz! Study!

• Student: Why is this dude giving us so many quizzes?
• Carofano: Gotta keep you all on top of your game. This is our last full quarter before our AP exam. This will be what the rest of AP Stat looks like. Stay on top of your homework. Ask questions. Come for help. "Thrive," as Zenia says.
• Here's your chapter 18 vocab list (with definitions):
• Remember, the vocab quiz will be all multiple choice
• ID Statistic or Parameter
• There will be two questions that ask if a given value is a statistic or parameter!
• Look at the quiz I passed back today! Or we had a homework last week about this!
• statistic: about a sample
• parameter: about a population
• Sampling Variability 
• the expected differences we see in sample statistics from sample to sample
• Standard Error
• *this did not come up in our notes--this is more of a ch. 19 word
• "an estimated standard deviation of a sampling distribution, calculated using sample statistics (rather than population parameters)
• Sampling Distribution:
• a plot of sample statistics taken from repeated random samples (of the same size)
• Central Limit Theorem:
• the sampling distribution for means (but it's also true for proportions) is approximately Normal for a large sample
• Know that as sample size increases the standard deviation of the sampling distribution decreases
• 10% condition (how to check it)
• the sample size must be less than 10% of the population size
• Sampling Distribution for Means
• is used with quantitative data
• Sampling Distribution for Proportions
• is used with categorical data
• Know which 3 conditions are checked for a sampling distribution for means
• 10% condition
• Large enough sample
• Randomization condition
• Know which 3 conditions are checked for a sampling distribution for proportions
• 10% condition
• Success/failure
• Randomization condition
• Why do we check the randomization condition?
• so we can be sure the sample is representative of the population
• Why do we check the success/failure (np>10, n(1-p)>10 )condition?
• so we can know our sample is large enough

2.) Homework (due tomorrow or Friday):

• One last bit of sampling distributions practice (this will also be assessed on our take home quiz this weekend):
• Sampling Distribution Summary HW! (Click Me!)

• Always check your ************ answers so you know if you're doing everything right! And then, if you got something wrong, go back and figure out your mistake--that's how you learn stuff!

•  (Key will be posted tomorrow)

3.) Weekend HW = TAKE HOME QUIZ

• Focus:
• Ch 18: Sampling Distributions
• Ch. 19 Intro: 
• Conditions for a one-prop z interval
• Creating interval on calculator
• Interpreting the confidence interval
• Why do we use confidence intervals?