Chapter Seven Notes.xlsx

Chapter Seven Notes.xlsx - In real life situations you may...

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In real life situations you may be able to indetify if a distribution is normal o but you may not know the paramters - such as the mean or standard deviation. In this case a sample will provide with which you can work. If you want a reliable sample, you must select the sample in a certain way. When each of the elements has an equal chance of being selected then th and the sample is called a simple random sample If a population is small you could number each member and randomly pick random numbers based on the sample size. How would you proceed if you were interested in a random sample of 10 t you have received? 1. Number each return from 1 to 100. 2. Get 10 random numbers between 1 and 100. if one repeats get anothe Generating random numbers with Excel: Returns an evenly distributed random number greater than or eq A new random number is returned every time the worksheet is c Syntax Returns a random number between the numbers you specify. A n returned every time the worksheet is calculated. A new random number is returned every time the worksheet is ca Syntax 0.6068 RAND() 50.302 RAND()*100 #N/A RANDBETWEEN(0,100) ex 7.1 p. 244 A computer database contains 1000 files. How can I select a random sam RAND ( ) RANDBETWEEN ( bottom , top ) Bottom is the smallest integer RANDBETWEEN will return. Top is the largest integer RANDBETWEEN will return.
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996 This is an observational study - the data already exist. When sending out questionnaires to sample population you can encounte Some problems: nonresponsive - only 50% of people complete and return it undercoverage - ex voter registration list wording bias - remember the Kinsey study we talked about If you know these problems exist there are methods that can solve them, b you have the problem.
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