Normal Distribution Problems- Two Common Mistakes

I see many students in my intro statistics courses missing problems related to the normal distribution. Common Mistake #1: One especially common mistake is not using the correct “standard deviation” to find probabilities and percentiles. Consider the following problem statement: A bank auditor claims that credit card balances are normally distributed, with a mean of […]

More on Multiple Regression Part 2

In the real world, we most often work with real data. And we build regression models using software such as Excel, StatCrunch, and, more recently, R. The output of those regressions give us a world of information about the regression models, enabling us to quickly determine if the overall model is statistically significant and if […]