- An answer key for tonight's hw is also posted below.
Today's Class Recap:
- Stamp = finding our sample statistic and ME given only the interval
- HW Q's: #8 and 38a discussed in class, also addressed any other HW q's
- Be sure to check the conditions for any "full interval" question (like 13
- Ch. 19 Notes:
- What is a point estimate
- How can we find ME and a point estimate given only a confidence interval? ("top right slide")
- What is the meaning of the confidence level?---how can we interpret a given confidence level?
- Tuesday: ch. 19 practice (AP FR and MC)
- 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)
Monday HW Answer Key:
- 1 (Finding sample size; A state's dep't of education....): n = 179 applications
- 2 (find point estimate and ME given a CI; A sales company....):
- a.) 90.5% = 0.905 = p-hat
- b.) 4.5% = 0.045 = ME
- 1 (How often do Americans dine out?)
- a.) p-hat = 0.18 = 18%
- b.) ME = 0.04 = 4%
- 2 (A poll of 2,017 likely voters...)
- C Level = 95% (z* = 1.96)
- 3 (A survey found that 69%...)
- ME = 2.38%
- 4 (A study was recently conducted...)
- Interval = 67.5% to 72.5%
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!
- What do I need to know about confidence intervals?
- 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...
- t-table
- invnorm(
- What is the full CI process?
- How do I check conditions for a one prop z interval?
- How do I do the math with my calculator and show the supporting formula?
- How do we interpret the meaning of a confidence interval?
- 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?
- How can we find the ME only given an interval?
- What does it mean to say "__% confident?"--how can we interpret the meaning of a confidence level?
- 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!
- Watch AP Stat Guy videos 6-9 in Unit 5 for some help!
- Use Khan Academy--this is aligned with AP Stat!
- Linked on the right WITH a course code
- Google stuff--anything about one proportion z intervals!
- 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?
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