Does gender have an impact on brain size

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Does gender have an impact on brain size

  1. 1. DOES GENDER HAVE AN IMPACT ON BRAIN SIZE? By: Allie Bricek
  2. 2. BACKGROUND  This study was by Willerman et al., at a large southwestern university.  In 1991, these researchers used Magnetic Resonance Imaging (MRI) to determine the brain size of a sample of 40 right-handed introductory psychology students who had indicated no history of alcoholism, unconsciousness, brain damage, epilepsy, or heart disease.
  3. 3.  These subjects were drawn from a larger pool of introductory psychology students with total Scholastic Aptitude Test Scores higher than 1350 or lower than 940 who had agreed to satisfy a course requirement by allowing the administration of four subtests (Vocabulary, Similarities, Block Design, and Picture Completion).  The scans consisted of 18 horizontal MR images. The computer counted all pixels in each of the 18 images and the total count served as an index for brain size.
  4. 4. ASKING “THE” QUESTION…  Does GENDER have an impact on BRAIN SIZE?  NULL: GENDER does not have an impact on BRAIN SIZE.  ALTERNATIVE: GENDER does have an impact on BRAIN SIZE.
  5. 5. FEMALE BRAIN SIZE W/ PIXEL COUNT 0 200000 400000 600000 800000 1000000 1200000 MRI_Count
  6. 6. MALE BRAIN SIZE W/ PIXEL COUNT 0 200000 400000 600000 800000 1000000 1200000 MaleMaleMaleMaleMaleMaleMaleMaleMaleMaleMaleMaleMaleMaleMaleMaleMaleMaleMaleMale MRI_Count
  7. 7. FEMALE AND MALE BRAIN SIZE W/ PIXEL COUNT - 200,000 400,000 600,000 800,000 1,000,000 1,200,000 MRI_Count MRI_Count
  8. 8. sample mean 1 862,654.60 Female stdev 1 55,893.56 pooled sample stdev 55902.456 sample size 1 20 std error 17677.909 sample mean 2 954,855.40 Male stdev 2 55,911.35 sample size 2 20 NULL: m1 = m2 Gender does not have an impact on brain size. ALTERNATIVE: m1 < > m2 Gender does have an impact on brain size. one-tailed or two tailed? 2 enter only 1 or 2 type of test? T test enter only z or t test statistic (obs) (5.216) critical measure 1.960 degrees of freedom 1,817,508.00 |obs| > critical?? YES p-value 0.000 a-level 0.050 ←enter alpha level here p-value < a-level?? YES REJECT THE NULL!!! HYPOTHESIS TESTS
  9. 9. CONCLUSION  REJECT THE NULL:  GENDER does not have an impact on BRAIN SIZE.  ACCEPT THE ALTERNATIVE:  GENDER does have an impact on BRAIN SIZE.
  10. 10. QUESTIONS OR CONCERNS?!?! Thank You!

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