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MORE DECKS TO EXPLORE

PRESENTATION OUTLINE

1.

THREATS TO INTERNAL VALIDITY

DIANNE CRISP, PhD
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2.

VALIDITY

  • Internal Validity
  • External Validity
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3.

WHAT IS INTERNAL VALIDITY?

EXPERIMENTS SEEK CAUSE AND EFFECT - CAN WE TRUST THAT RESULT OR COULD THERE BE ANOTHER EXPLANATION?
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4.

LEARNING CHECK

EXPERIMENTS
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5.

INDEPENDENT VARIABLE

THE VARIABLE THE RESEARCHER MANIPULATES
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6.

DEPENDENT VARIABLE

THE VARIABLE THE RESEARCHER MEASURES FROM PARTICIPANTS
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7.

RANDOM SELECTION AND RANDOM ASSIGNMENT

PARTICIPANTS RANDOMLY SELECTED FROM POPULATION AND RANDOMLY ASSIGNED TO GROUPS
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8.

PRE-TEST TRUE OR FALSE?

  • Speed of reaction time is an independent variable
  • Scores on a Standardized Self Esteem Scale represent a well- operationalized dependent variable
  • We could generalize our findings to all students having tested business classes at Langara
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9.

THREATS TO INTERNAL VALIDITY

  • Confounds
  • Attrition
  • Cohort Effects
  • Statistical Regression
  • Diffusion
  • Maturation
  • Blinding of Researcher and Participants
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10.

OUR EXPERIMENT

RANDOMLY ASSIGN ONE OF MY CLASSES TO FACE TO fACE, AND THE OTHER TO FULLY ONLINE
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11.

CONFOUNDS

WHEN THE IV COULD HAVE RESULTED FROM A THIRD VARIABLE
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12.

ATTRITION

PARTICIPANT DROP-OUT CAN LEAD TO BIAS SAMPLE
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13.

COHORT EFFECTS

PRE-EXISTING DIFFERENCES AMONG GROUPS
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14.

STATISTICAL REGRESSION

EXTREME SCORES WILL TEND TO FALL CLOSER TO AVERAGE (MEAN ) SCORES ON RETESTING
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15.

DIFFUSION

HAPPENS WHEN THE TREATMENT GROUP AND CONTROL GROUP INTERACT
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16.

MATURATION/TESTING REPEATS

IMPACT OF TIME - TEST RE-TEST
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17.

BLINDING?

ARE THE RESEARCHER AND THE PARTICIPANTS BLIND TO THE CONDITIONS PARTICIPANTS ARE IN?
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18.

POST TEST WHICH OF THE FOLLOWING ARE THREATS?

  • Participants volunatarily choose their group
  • The same test is used twice for same participants
  • The subjects know what the independent variable is
  • One group receives the test in person, the other online
  • All of the above
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19.

Questions?

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20.

Untitled Slide

Dianne Crisp