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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
When you are calculating the class width. How do you decide when to round to 2 or more decimal places? This question comes from Chapter 2 homework question 12. Thanks for your time.
Posted to STATS 1 on Saturday, January 18, 2014 Replies: 1
Hi Azariel,
When determining class width follow this simple guideline. If the class width calculation gives you a decimal round to the nearest whole number. If the class width turns out to be a whole number, try using the next highest whole number.
Usually, the value will need to be higher than the calculation of width = range/# of classes. Remember that formula only provides the smallest width that might work. It typically does not work. The only way to know for sure is to try to form your classes with the value to see if the last class contains your largest data value. If it does, you have an acceptable width (note: there is more than one correct answer for these problems).
See the video below for more detail,
Professor McGuckian