frequency-notes

# frequency-notes - Last Lecture Descriptive vs inferential...

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Last Lecture Descriptive vs. inferential statistics Samples vs. populations Variables and measurements Today Frequency distributions Grouping data Relative frequency Cumulative frequency Percentiles Psy 320 Frequency Distributions, 1

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Statistic Deﬁnition : A statistic is a computation performed on a sample of measure- ments. Given a sample of measurements { M 1 ,M 2 ,M 3 ,...,M n } , I could Add them up: S = n i =1 M i is a statistic. Psy 320 Frequency Distributions, 2
Frequency Distributions Deﬁnition: a frequency distribution is a table indicating how often each measured value occurred. { 1 , 2 , 3 , 3 , 4 , 4 , 4 , 5 , 5 , 6 , 7 } Score Frequency X i f ( X i ) 1 1 2 1 3 2 4 3 5 2 6 1 7 1 Psy 320 Frequency Distributions, 3

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County Births Poverty County Births Poverty County Births Poverty Adams 8.7 35 Hamilton 6.2 19.6 Noble 4.6 22.7 Allen 6.9 17.9 Hancock 3.7 8.5 Ottawa 3.6 9.5 Ashland 4.1 17.2 Hardin 4.4 21.8 Paulding 4.6 12 Ashtabula 5.5 23.8 Harrison 4.6 29.3 Perry 6.4 25.4 Athens 5.7 29.3 Henry 4.1 8.7 Pickaway 5.3 16.3 Auglaize 3.2 8.1 Highland 6.5 19.4 Pike 8.5 36.9 Belmont 3.4 25.8 Hocking 5.6 20.8 Portage 3 13.4 Brown 5.7 18.7 Holmes 1.6 24.5 Preble 5 15.6 Butler 4.8 13.2 Huron 4.5 13 Putnam 3.1 7.1 Carroll 4.2 14.6 Jackson 7.5 30.2 Richland 6 16.5 Champaign 4 12.4 Jeﬀerson 5.5 26.3 Ross 5.8 24.9 Clark 6.6 20.5 Knox 3.7 18.2 Sandusky 5 12 Clermont 4.6 11.9 Lake 2 7.1 Scioto 8.3 37.7 Clinton 4.4 14.7 Lawrence 3 33.2 Seneca 6 14.3 Columbiana 4.6 23.2 Licking 4.6 14.8 Shelby 4.7 10.5 Coshocton 4.8 17.8 Logan 5.5 13.5 Stark 4.5 16.4 Crawford 4.6 15.4 Lorain 5.8 17.4 Summit 4.6 18.1 Cuyahoga 5.5 21.6 Lucas 6.5 21.5 Trumbull 4.7 17 Darke 3.2 12.1 Madison 4.9 11.3 Tuscarawas 3.9 14.4 Deﬁance 5.1 11.4 Mahoning 6 25 Union 4.4 9.5 Delaware 2.5 6.6 Marion 6.5 18.3 VanWert 3.3 7.6 Erie 5.2 12.7 Medina 2.3 7.9 Vinton 6.5 31.8 Fairﬁeld 3.9 11.7 Meigs 4.8 35 Warren 2.8 8.7 Fayette 5.6 22 Mercer 2.6 7.6 Washington 3.7 18 Franklin 4.9 17.6 Miami 4.1 12.3 Wayne 2.4 17.2 Fulton 3 7.6 Monroe 2.7 28.8 Williams 4.2 10.7 Gallia 5.4 28.5 Montgomery 5.3 19.5 Wood 3.2 8.8 Geauga 1 8.5 Morgan 5 31.3 Wyandot 3.2 10 Greene 3.5 12.1 Morrow 4.6 17.4 Guernsey 5.5 24.3 Muskingum 5.4 21.4 Births = percentage of mothers aged 10-17. Poverty = percentage of children living in poverty.
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frequency-notes - Last Lecture Descriptive vs inferential...

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