mean=1.5 standard deviation=10 n=20 sample mean=1.2

1.2-1.5 = 1.3 10/4.47213 =2.236 1.3/2.236= -0.134

p value= .3669?

but i get .4483

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- June 8th 2008, 09:42 PMcrashukhow did they get this?
mean=1.5 standard deviation=10 n=20 sample mean=1.2

1.2-1.5 = 1.3 10/4.47213 =2.236 1.3/2.236= -0.134

p value= .3669?

but i get .4483 - June 8th 2008, 09:45 PMCaptainBlack
- June 8th 2008, 10:28 PMcrashuk
- June 8th 2008, 11:50 PMmr fantastic
There must be more to the question than just this! And what have I said about the setting out ....!?

Is it the sample standard deviation or the population standard deviation?

If the latter, than the z-statistic is appropriate and the p-value is 0.4467 (correct to four decimal places).

If the former, than the t-statistic is appropriate (provided the data come from a normal population) and the p-value is 0.4474 (correct to four decimal places).