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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
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…
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
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”
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
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. ..
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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