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ASK THE PROFESSOR FORUM

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

Ask the Professor Forum

Professor,

I have a question about homework problem #5, for section 3.2. Why is it that 1.02, 3, 31/30, and sqrt of 3 cannot be probabilities?

Respectfully,

Alex M

Posted to STATS 1 on Sunday, October 6, 2013   Replies: 1


Professor Mcguckian
10/06/2013
8:58 PM EST

Hi Alex,

There are a couple of lines in the notes that talk about two important properties of probability. You can find these two properties just before example 31 in section 3.2 of the notes. 

The answer to the question you asked is simple to answer here though.  All probability values must be between 0 and 1 inclusive. This means probabilities cannot be less than zero or more than one. Each of the numbers you listed above have decimal values that are greater than one.

 

Hope that answers it for you,

Professor McGuckian

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