RSCH 2501 Week 8 Lecture Slides - Basic Stats

RSCH 2501 Week 8 Lecture Slides - Basic Stats -...

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RSCH 2501  Introduction to Research Methods Understanding research: more terminology and concepts …and statistics week
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Today:   lit search assignments  read article summary, answer questions Week 9:  more statistics Week 10:   another article assignment      (read, discuss, take quiz) Overview comments for final exam Final exam: multi-guess, true-false, matching updated review outline will be on  Blackboard
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Assignments: Read for week 10 ! You’ll have to know some statistics ! O n B l a c k b o r d w !
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selected statistical  concepts… 
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Independent variable? Dependent variable?
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Independent variables      Precede dependent variables in time    Treatment or intervention used Dependent variables      What is measured as an outcome    Values depend on independent  variable
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Independent variable? Dependent variable? Confounding variables? e.g., 50 patients with   migraine headaches    pre- and post-chiropractic care…
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“sample” vs. “population” “random sampling” “convenience sampling”  “randomization”
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convenience sampling with randomization Group A Group B
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What is your pain R IGHT N OW ? worst no possible pain pain ________________________________________________________________ _ 0 1 2 3 4 5 6 7 8 9 10 Numeric Rating Scale
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Delay in nerve conduction velocity none complete block ________________________________________________________________ _ 0 1 2 3 4 5 6 7 8 9 10 Severity of vertebral subluxation none severe ________________________________________________________________ _ 0 1 2 3 4 5 6 7 8 9 10
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Participant Pre-care 1 5 2 5.5 3 6 4 6.5 5 7 6 7.5 7 8 8 8.5 9 9 10 9.5 Total 72.5 mean 7.25 back to the migraine headache people. ..
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Participant Pre-care 1 5 2 5.5 3 6 4 6.5 5 7 6 7.5 7 8 8 8.5 9 9 10 9.5 mean 7.25 Participant Pre-care 11 6.6 12 6.7 13 6.8 14 6.9 15 7 16 7.5 17 7.6 18 7.7 19 7.8 20 7.9 mean 7.25
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some of the scores are  above the  mean  and  some are below…  This can be referred to 
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RSCH 2501 Week 8 Lecture Slides - Basic Stats -...

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