Introduction_to_experiments_-_notes_version_update

Introduction_to_expe - Cell phones and sperm counts Hypothesis that electromagnetic waves produced by cell phones may have adverse effects on mens

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8/4/2010 1 Introduction to experiments Cell phones and sperm counts Hypothesis that electromagnetic waves produced by cell phones may have adverse effects on men’s sperm 361 men undergoing fertility evaluation at a fertility clinic Self-report how often use cell phones Measure sperm counts from semen samples Agarwal et al. (2008) Cell phones and sperm counts Cell phones and sperm counts Alternative explanations for the cell phone – sperm count correlation other than the idea that cell phone usage causes lower sperm counts? Does the negative correlation between cell usage and sperm counts at least provide evidence that phone usage may cause lower sperm counts? Causal evidence from correlational data may depend on converging sources of evidence:
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8/4/2010 2 Intelligence Operational definitions: Intelligence is related to the speed of mental processing. Intelligence is the ability to think creatively. Intelligence is a variety of mental and physical abilities. Intelligence is a general factor. Intelligence Quotient (IQ) Wechsler Adult Intelligence Scale Verbal subtest Comprehension Why should we obey traffic laws and speed limits? Information What is entomology? Arithmetic Six men can finish a job in ten days. How many men will be needed to finish the job in two and a half days? Wechsler Adult Intelligence Scale Performance subtest Block design IQ Population Distribution with this score 14% 10% 100 85 70 55 115 130 145 IQ % of people 6% 2%
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8/4/2010 3 Reliability Is IQ a reliable indicator of intelligence? Test-retest reliability Compare IQ scores on two occasions and determine the degree to which they are related Reliability 0 100 50 2 nd IQ test r = +.80 positive correlation 0 100 50 2 nd IQ test r = 0 no correlation 0 100 50 2 nd IQ test r = -.70 negative correlation 0 50 100 1 st IQ test 0 50 100 1 st IQ test 0 50 100 1 st IQ test Reliability Is IQ a reliable indicator of intelligence?
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This note was uploaded on 12/18/2010 for the course PSY 7 taught by Professor Sherman during the Summer '09 term at UCSB.

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Introduction_to_expe - Cell phones and sperm counts Hypothesis that electromagnetic waves produced by cell phones may have adverse effects on mens

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