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can we assume a normal distribution? if so, then what criteria should we be looking for?

yes we can assume a normal distribution @amistre64

okay start with the mean, what is the mean of this data

The mean is 531

now find the sample standard deviation

82.79157

thats quite a bit of deviation right

yes haha

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right I got that too :)

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you can find the exact probability

but i dont think we can use this one yet actually

okay so what do we do

I know the hypotheses

oh what have u studied so far actually depends on that

Have you done null hypothesis test or T-test,

well the lesson I am on is t distributions with the calculator

id have to review the rules for t test too, to help you

What you calculated there is the Z score, t values are different

shoot, you are right

did u watch the video, he is very clear

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find your t and degrees of freedom and look at t chart