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For more information, please see full course syllabus of AP Statistics
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Lecture Comments (1)

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Post by So-Hee Park on March 28 at 12:15:59 AM

Can you explain why we are using the t* in calculating the second example while we used the z* in the first and third example? I do not understand what the different conditions were in the question that made you know whether t* or z* had to be used.

Confidence Intervals

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
  • Lesson Overview 0:07
  • Why Calculate a Confidence Interval? 0:28
    • Using a Statistic to Estimate a Parameter
  • What is a Confidence Interval? 1:24
    • Confidence Interval
  • General math Behind a Confidence Interval 2:51
    • Point Estimate
    • Critical Value
  • Z-Table 6:06
    • Z-Table
  • T-Table 7:07
    • T-Table
  • General math Behind a Confidence Interval 7:50
    • Point Estimate
    • Critical Value: Mean & Proportion
    • Standard Error: Mean & Proportion
    • Calculating Using Your Calculator
  • Steps to Calculating a Confidence Interval 12:09
    • Step 1: Read
    • Step 2: Check Your Conditions
    • Step 3: Calculate
    • Step 4: Interpret
  • Example I: Confidence Interval 16:29
  • Example II: Confidence Interval 29:57
  • Example III: Confidence Interval 42:31