Pages
Archives

Recent Posts
Categories
 5number summary Alternative Hypothesis American roulette Bar Graph Benford's Law Bill Gates Binomial Coefficient Binomial distribution Binomial Experiment Birthday Problem Blaise Pascal Chevalier de Mere Chisquare goodness of fit Chisquare statistic Chisquare test Completely Randomized Experimental Design Conditional distribution Confidence Interval Confounding Correlation Critical Value Cryptography Descriptive statistics Diabetes DoortoBalloon Time Double blind Empirical Rule Expected value Experiments First Quartile Gambling Games of chance Games of dice Histogram Interquartile Range Introduction to statistics Introductory statistics Joint distribution LeastSquares Regression Lurking variables Marginal distribution Matched Pairs ttest Mean Median Normal Curve Normal Distribution Null Hypothesis Observational studies OneSample tProcedures OneSample ttest pvalue Paul Allen Percentile Placebo Probability Randomized Experiments Reasoning of Statistical Inference Regression Line Residual Plot Residuals Resistant numerical summary Sampling Distribution Scatterplot Standard Deviation Statistical Inference Statistics In Action Stemplot ttest Tests of Significance The law of large numbers Third Quartile Time Plot Twoway tables Uniform Distribution Warren Buffet
Monthly Archives: October 2011
Presidential Elections and Statistical Inference
We use an example of presidential elections to illustrate the reasoning process of statistical inference. The current holder of a political office is called an incumbent. Does being an incumbent give an edge for reelection? The answer seems to be … Continue reading
A Case of Restaurant Arson and the Reasoning of Statistical Inference
I know of a case of a restaruant owner who was convicted for burning down his restaurant for the purpose of collecting insurance money. It turns out that this case is a good example for introducing the reasoning process of … Continue reading
Rolling Dice to Buy Gas
The price of gas you pay at the pump is influenced by many factors. One such factor is the price of crude oil in the international petroleum market, which can be highly dependent on global macroeconomic conditions. Why don’t we … Continue reading
The Middle 80% Is Not 80th Percentile
A student sent me an email about a practice problem involving finding the middle 80% of a normal distribution. The student was confusing the middle 80% of a bell curve with the 80th percentile. The student then tried to answer … Continue reading
Coin Tossing and Family Size
If you a toss a coin 9 times, what is the probability of obtaining 8 heads and 1 tail? I just tossed one penny 9 times and the following is the resulting sequence of heads and tails. The above little … Continue reading