Sec1-3 - STAT 101 Dr Kari Lock Morgan Collecting Data...

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Statistics: Unlocking the Power of Data Lock 5 STAT 101 Dr. Kari Lock Morgan Collecting Data: Experiments SECTION 1.3 Association versus Causation Confounding Variables Observational Studies vs Experiments Randomized Experiments
Statistics: Unlocking the Power of Data Lock 5 Announcements My office hours this week are cancelled (I have a bad cold and don’t want to get anyone sick – sorry!). Feel free to email me with questions: [email protected] TA office hours (in Old Chem 211A): Yating Gu: Thurs 5 – 7pm Tori Hall: Sun 4 – 6pm David Clancy: Sun 7 – 9pm Stephanie Sun: Mon 4 – 6pm Mao Hu: Tues 7 – 9pm Stat Ed Center (Old Chem 211A): Sun-Thurs 4 – 9pm
Statistics: Unlocking the Power of Data Lock 5 Voluntary Survey Study on improving student self-confidence in STEM fields (voluntary, prizes available):
Statistics: Unlocking the Power of Data Lock 5 Review If sampling bias exists, we cannot make generalizations from the sample to the population Taking a random sample avoids sampling bias Even if sampling bias is avoided, bias may enter the data in other forms (wording, context, inaccurate responses, etc.) Always think critically about how the data were collected,
Statistics: Unlocking the Power of Data Lock 5 DATA Data Collection and Bias Population Sample TODAY
Statistics: Unlocking the Power of Data Lock 5 Explanatory and Response If we are using one variable to help us understand or predict values of another variable, we call the former the explanatory variable and the latter the response variable Examples: Does meditation help reduce stress? Does sugar consumption increase hyperactivity?
Statistics: Unlocking the Power of Data Lock 5 Association and Causation Two variables are associated if values of one variable tend to be related to values of the other variable Two variables are causally associated if changing the value of the explanatory variable influences the value of the response variable
Statistics: Unlocking the Power of Data Lock 5 Explanatory, Response, Causation For each of the following headlines: Identify the explanatory and response variables (if appropriate). Does the headline imply a causal association? 1. “Daily Exercise Improves Mental Performance” 2. “Want to lose weight? Eat more fiber!” 3. “Cat owners tend to be more educated than dog owners”
Statistics: Unlocking the Power of Data Lock 5 Association and Causation ASSOCIATION IS NOT NECESSARILY CAUSAL! Come up with two variables that are associated , but not causally Come up with two variables that are causally associated Which is the explanatory variable? Which is the response variable?
Statistics: Unlocking the Power of Data Lock 5 College Education and Aging “Education seems to be an elixir that can bring us a healthy body and mind throughout adulthood and even a longer life,” says Margie E. Lachman, a psychologist at Brandeis University who specializes in aging. For those in midlife

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