RSCH 2501 Week 9 Lecture Slides - More Stats

# RSCH 2501 Week 9 Lecture Slides - More Stats - more...

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RSCH 2501  Introduction to Research Methods more statistics week

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Week 8 lit search: hand back next week TODAY: MORE STATISTICS Week 10:  another article assignment      (read, discuss, take quiz) Review & wrap-up of statistics Overview comments for final exam Final exam: multi-guess, true-false, matching updated review outline will be on  Blackboard
(memory check) Independent, dependent, confounding variables Sample vs. population Convenience sampling, randomization Mean, standard deviation Independent & dependent t-tests “Paired” and “2-sample” t-tests ANOVA α , P-value, CI

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United States 2007  median   household income:  \$50,233 \$ \$\$\$\$\$\$\$\$\$\$\$\$
\$ \$\$\$\$\$\$\$\$\$\$\$\$ X median X mean

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mean   vs.   median Spinal muscle activity before and after chiropractic  adjustment, measured by EMG (electromyography). DeVocht JW, Pickar JC, Wilder DG. Spinal manipulation alters electromyographic activity of paraspinal muscles: a descriptive study J Manipulative Physiol Ther 2005; 26(7): 465-71.

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13.15 For the Activator group,  pre-SM values range: 0.41 to   13.15  μ V  (median, 1.93  μ V)   post-SM values range: 0.41 to 2.97  μ (median, 1.06  μ V)
Hypothetical practice, most common reasons for  initial entry:   Low back pain  Wellness  Visceral complaints  Neck pain  Sciatica  Headache  Depression Type of data?

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low back pain 36 40 30 20 10 0 wellness 10 sciatica 18 neck pain 27 Visceral complaints 9 HAs 15 depression 7 Hypothetical number of new patients with each main reason for beginning care for 2-month period Type of data?
low back pain 36 40 30 20 10 0 wellness 10 sciatica 18 neck pain 27 Visceral complaints 9 HAs 15 depression 7 Hypothetical number of new patients with each main reason for beginning care for 2-month period “categorical” data:   M ODE ?

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“Ordinal”:  measurements ordered by rank 2007 Peachtree Road Race results: Women’s Open Division 1       W UDE  A YALEW   31:44 2       A LICE  T IMBILILI  31:46 3
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• Winter '11
• BrentS.Russell
• Correlation and dependence, Pearson product-moment correlation coefficient, Covariance and correlation, Spearman's rank correlation coefficient, CHI SQUARE, Appa

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