EHHS AP Stat: Fri-yay!

Friday, February 22, 2019

Responsibility #1: Weekend HW

For 7,8: when it says, "for a given" or "for a fixed" or "for a specified" it means that values is staying the same...

So "for a given sample size," means, if n stays the same, "reducing ME will mean lower confidence"--T or F? (that's #8 a)

What do you notice--how much larger of a sample did we need to cut the margin of error in half (from 6% to 3%)?
How could you have answered (c) without using the "finding n" formula?

For 35, more finding n--use today's notes/examples!
For 38a, "explain why the poll is actually inconclusive" means "explain why we cannot conclude that the amendment will win" (based on this poll and confidence interval)

Responsibility #2 = Self-Assess Your Understanding of Confidence Intervals?

It is absolutely essential that you make sure you're on top of all this interval stuff--not only do we have a quiz on Wednesday, but we also know that these concepts will be repeated multiple times over the remainder of AP Stat!

When/why do we create a confidence interval?
What symbol is a sample proportion/%? A population proportion %? (statistic v. parameter)
How do we identify/calculate x, n, and p-hat for a given context?
What wording in a question suggests I have to create a CI?
How do I find the critical value for a given C. Level using...

How can we use our confidence intervals to assess some claim? (like 13d from the weekend hw)
What is ME?
How can we calculate margin of error given a sample size, C. Level, and p-hat?
How can we calculate sample size for a given ME?
How does changing n affect the ME? the width of an interval?
How does changing C. Level (and as a result, z*) affect the ME? the width of an interval?
How can we find the value of p-hat (a point estimate) only given an interval? (Monday's class)
How can we find the ME only given an interval? (Monday's class)
What does it mean to say "__% confident?"--how can we interpret the meaning of a confidence level? (Monday's class)

If you have any questions, things you're confused about, or just want a deeper understanding, take the time this weekend to use your resources!

Do this now! If you try to assess your own learning this weekend, then you have Monday/Tuesday to come see me for any help before our quiz--don't wait until it's too late?

Responsibility #3: Catch up on HW!

I will accept any/all chapter 19 (confidence interval) HW for full credit on Monday
You'll have to come show me before school/after school/during study hall if I don't have time to check in class....
Check PowerSchool to see if you're missing anything or have only partial credit (all grades are up to date)
AFTER MONDAY I WILL NOT ACCEPT ANY MORE LATE HW!

Today's Class Recap:

Be sure to check the conditions for any "full interval" question (like last night's slide)

Next Week's Plan:

Stamp = T/F (like 7, 8 from hw)
What is a point estimate?
How can we find the value of a point estimate and the margin of error only given an interval?
What does the confidence level actually mean?

Tuesday: finish any ch. 19 notes (if necessary), ch. 19 practice (FR?)
Wednesday: goal = ch. 19 quiz on this day, then intro to ch. 20 (hypothesis testing)
Thursday and Friday: ch. 20 notes (one proportion z tests)

EHHS AP Stat