Skip to main content

Posts

chartr's "Speed or Accuracy? It's hard to do both in fast food drive-thrus"

Sometimes, you just need a new, simple example for a homework question or a class warm-up.   I eyeballed and entered the   data here  ( r   = -.55). Enjoy. I use this little example to explain to use the regression formula to make a prediction. Here are my slides .

Between and within group variance, explained with religion, politics, and climate change.

Ages ago, I shared how I teach ANOVA at a conceptual level. I describe within and between group variance using beliefs about the human role in climate between and within different religious groups. This data is now old. And it described global warming, not climate change, which is a crucial language distinction. So you  can imagine my delight when Pew recently released  updated and improved data investigating this issue.  In my attempt to keep the mood light when discussing an example featuring 1) religion, 2) climate change, and 3) politics, I ask students to think about how many different opinions are probably represented around their family's Thanksgiving table. Despite having much in common as a family, like, perhaps, geography, shared stories, and religion, there are still a lot of within-group differences of opinion. This leads to a discussion about people of different religions having between and within group differences of opinion regarding beliefs about global cl...

YouGov America's Thanksgiving-themed chi-square examples

YouGov gifts us with seasonal chi-square examples  with data on Thanksgiving food controversies. For example: How do people feel about marshmallows on sweet potato dishes? This doesn't look randomly distributed to me. Which is more beloved: Light or dark turkey meat? If you want examples for the chi-square test of independence, dig into the PDF containing ALL of this survey's data. The distribution of people who like cranberry sauce by age group does not appear random.