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## Stat 1127, Week one notes

by: Jessica Harbin

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# Stat 1127, Week one notes STAT 1127

Marketplace > Columbus State University > STAT 1127 > Stat 1127 Week one notes
Jessica Harbin

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## About this Document

Stats notes on frequency distribution in chapter 2 text book: " Essential of statistics 4th edition"
COURSE
Introductory Statistics
PROF.
Jungmin Yun
TYPE
Class Notes
PAGES
2
WORDS
CONCEPTS
#stat1127, #CSU, #statnotes
KARMA
25 ?

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This 2 page Class Notes was uploaded by Jessica Harbin on Thursday August 18, 2016. The Class Notes belongs to STAT 1127 at Columbus State University taught by Jungmin Yun in Fall 2016. Since its upload, it has received 5 views.

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Date Created: 08/18/16
Stat1127 Week 1 Notes Frequency Distribution Ch. 2 [Sidebar Title] Frequency Distribution shows how a data set is partitioned among all of several categories by listing all the categories along w/ # of data values in each of the categories Frequency: # of original values that falls into the class Ex. -Lower Class Limits: the Length (cm) Tally Frequency smallest # that can belong to diff classes 0 – 0.99 I I I 3 ex. 0, 1 ,2 1 – 1.99 IIII 5 -Upper class Limits: the largest # that can belong 2 – 2.99 IIII III 8 to diff classes ex. 0.99, 1.99, 2.99 Class Limits: -Add # together & divide 0 – 0.99 , 1 – 1.99 , 2 – 2.99 by 2 = Class Boundaries 0.05 0.095 1.095 -Class Boundaries: # use to separate the classes’ ex. 0.05, 0.095, 1.995 Histogram a graph consisting of bars of equal width drawn adjacent to each other 8 6 Horizontal scale: Use class boundaries or 4 midpt 2 Vertical scale: Use the 0 0.095 1.995 2.995 class frequencies You can also draw the histogram with class midpt. Class Midpt: the values in the middle of the classes ex. 0.495, 1.495, 2.495 Midpt: lower class limit + upper class limit divided by 2 Stat1127 Week 1 Notes Relative Frequency of an event is the frequency of that event expressed as a fraction (or decimal equivalent of the total frequency) Cumulative Frequency of an event is the sum of the frequencies up to and including that event. CF = Cumulative Sum Cumulative Relative Frequency of an event is the sum of the relative frequency up to and including the event. Ex. Class Frequency Cumulative Fr. Relative Fr. Cum. Rel. Fr. 20-29 10 10 10/991 10/991 30-39 132 142 132/991 142/991 40-49 284 426 284/991 426/991 50-59 300 726 300/991 726/991 60-69 175 901 175/991 901/991 70-79 65 966 65/991 966/991 80-89 25 991 25/991 991/991 = 1 Total 991

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