Mean and Standard Deviation Using the Casio fx-9860Gii Calculator

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A short video showing how to calculate the mean, standard deviation and variance using the Casio fx-9860Gii calculator.
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Question - what settings would you have to change if you entered your raw data into list 1 and it's displaying an error

ariisair
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I think that seven randomly selected students is a sample (the size of the sample is smaller than populations). The population would be all the students who took the test. So, i got a little confused when you said tha "sx" is a sample population. What does that mean? And if you meant sx is the standard deviation of the sample, then shouldnt we use this instead of σx ?

epsilon.