Download e-book for iPad: An Introduction to Statistics by George Woodbury

By George Woodbury

ISBN-10: 0534377556

ISBN-13: 9780534377557

Many records texts lack well-defined connections between fabrics awarded, as though different issues have been disjointed. during this new textual content, George Woodbury effectively illustrates the traditional connections among chance and inferential information and among self belief periods and speculation trying out, for instance. during the textual content, the writer presents reasons which are effortless to persist with and examples which are concept-based.

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Example text

For example, we could begin with person number 19 and then select every 50th person from there. One potential problem with this type of sampling arises with a list that 9 10 CHAPTER 1 Introduction to Statistics—Analyzing Data follows a certain pattern. For example, if we had a list of the number of customers at a restaurant every day for an entire year and selected every 21st entry, we would always select the same day of the week. Stratified sampling is an excellent way to try and ensure that a sample looks just like the population but smaller, although it requires the most resources and information about the population.

In a probability sample, each member of the population is equally likely to be chosen to be included in the sample. One method of sampling is random sampling. The basic idea is to write down each member of the population on a piece of paper, put all of the pieces in a big hat, mix them all up, and then blindly reach in and select one piece of paper at a time. In practice, we arrange the population in an ordered list. Then we randomly select numbers that correspond to members of the population on the list.

Down the left side of the screen). Cell A1 is the cell in column A and row 1. In cell A1, type the following command and press Enter on your keyboard: =RANDBETWEEN(1,10384) RANDBETWEEN is Excel’s built-in function to generate a random integer. The first number in the parentheses is the lowest integer that could be generated, and the second number in the parentheses is the highest integer that could be generated. Since there are 10,384 students, we would arrange the list from 1 to 10,384. The number that appears in cell A1 after you press Enter will tell us the first student to include in the sample.

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An Introduction to Statistics by George Woodbury


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