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Course Documents
Chapter 1 - Intro
Chapter 2 - Methods for Describing Sets of Data
Chapter 3 - Probability
Chapter 4 - Discrete Random Variables
Chapter 5 - Normal Random Variables
Chapter 6 - Sampling Distributions
Chapter 7 - Confidence Intervals
Chapter 8 - Tests of Hypothesis: One Sample
Chapter 9 - Confidence Intervals and Hypothesis Tests: Two Samples
Sample Exam I: Chapters 1 & 2
Sample Exam II: Chapters 3 & 4
Sample Exam III: Chapters 5 & 6
Sample Exam IV: Chapters 7 & 8
Hello Professor,
I am trying to do Homework Problem 40 for Section 7.4. I can't seem to figure out how to use it with Z instead of T. Can you please explain how to do this problem?
Thank you
Posted to STATS 2 on Tuesday, September 10, 2013 Replies: 2
Hi Genessys,
Here is a video explaining the problem:
Just to summarize what the video shows: the first step here is to check if n is greater than 30. If it is, we find Za/2 not ta/2. Since, we are finding Za/2, we do not need to worry about the degrees of freedom. We go to the t-table looking up a/2 in the top row, then we go straight to the bottom of that 0.01 row where the Za/2 value is located.
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