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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

Hi! I am having problems with number 36 from our hw. For the sample variance, I am getting 4,292,520,442 when the answer says it is 429,252,044.2. And so I'm also getting the standard deviation wrong because of that one decimal point off. I don't know if I am putting it wrong in my calculator or what.

Thanks!

Posted to STATS 1 on Thursday, January 30, 2014   Replies: 2


Professor Mcguckian
01/31/2014
12:14 AM EST

Hi Lauren,

The calculation should be done as follows:

There are 21 data values, so n = 21.

The variance will be = (21*15,594,326,388-383,660^2) / (21*20) = 429,252,044.2

If this is the only one of these questions giving you difficulty, it is probably due to the large numbers. You will not face such large numbers on the exam, so I wouldn't worry about it.

Professor McGuckian


.
01/31/2014
12:20 AM EST
Thank you! Got it now

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