Power analyses and sample size calculations are important parts of many research projects. Often, before data are even collected, it is necessary to calculate and justify the required sample size for ...

The following statements create a SAS data set named BATTERY, which contains the number of alkaline batteries per lot failing an acceptance test. The number of batteries tested in each lot varies but ...

Jason Fernando is a professional investor and writer who enjoys tackling and communicating complex business and financial problems. Erika Rasure is globally-recognized as a leading consumer economics ...

Statistical testing provides a paradigm for deciding whether the data are or are not typical of the values expected when the hypothesis is true. Because our objective is usually to detect a departure ...

RBR’s lead story today (6/30) has Arbitron defending its sample size. That’s a story we’ve heard for years. For most of my career, Arbitron defended ratings produced by the diary method. They used ...

Nielsen is planning a major expansion in its sample base across the nation. The two largest television-viewing markets, New York and Los Angeles, will see sample size increases of 300 homes next year, ...

The following data set (WIRE) contains breaking strength measurements recorded in pounds per inch for 25 samples from a metal wire manufacturing process. The subgroup sample sizes vary between 3 and 7 ...