I mentioned the fact that variability is a concept that will run throughout the book. I said that you need only one cow to find out how many legs cows have, whereas you need many more to estimate their average milk production. How would you expect that variability would contribute to the size of the sample you would need? What would you have to do if you suspected that some varieties of cows gave relatively little milk, while other varieties gave quite a lot of milk?
Answer to relevant QuestionsThe Mars Candy Company actually keeps track of the number of red, blue, yellow, etc. M&MsTM there are in each batch. (These make wonderful examples for discussions of sampling.) a) This is an example of data. An example of ...Drawing from a telephone book has always been used as an example of bad random sampling. With the rapid expansion of Internet use, why would a standard telephone book be an even worse example than it used to be? With reference to Exercise 2.15, the data for the Eyes Elevated condition are Using Y for this variable, (a) What are Y1 and Y10? (b) Calculate ΣY. Can an ordinal variable be measured on a continuous scale? Create a stem-and-leaf display for the ADDSC score in Add.dat.
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