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Unformatted text preview: Z - Confidence IntervalAlways start each new problem from the home screenSay we want to develop a 95%confidence interval for the population mean from a sample size of 35where we know the sample mean is 100and the population deviation is 12.For this problem we want Z-Intervalbecause we are given sigma.On the calculator we will choose "7 :Zinterval" from the "TESTS"menu.Now go to the "TESTS" menu so press ( this screen will appear)Arrow rightto "TEST ". Arrow down to " 7 : ZInterval "( see below left)Press (you will see upper right screen)You must highlight either "Data"or "Stats" and press If you choose "Data", the calculator will read the data from LIST.If you choose "Stats", you will have to enter the settings yourself.For this problem we want to highlight "Stats",and press NextYou must set s :12, mean :100, n : 35, C-Level : .95 Now highlight "Calculate" and press (see screen below)As you can see our confidence interval is ( 96.024 , 103.98 ) This means that repeated samples from this population will give a mean value...
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This note was uploaded on 05/04/2011 for the course ECON 131 taught by Professor Buckley during the Spring '11 term at Clearwater Christian.
- Spring '11