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Using TI calculator for P-value from t statistic

In a significance test about a population mean, we first calculate a test statistic based on our sample results. We can then use technology to calculate the p-value based on that test statistic using a t distribution with n-1 degrees of freedom.

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• I do not have that kind of calculator so the only option is using the t table. However, when doing this, I see that the closest value to the given t value of 1,9 is 1.943 and it leads to 0.05. So it seems to be equal to alpha. I want to make sure whether it still means we fail to reject because t table and calculator have different results according to the video?
• When I typed in the exact data like you did into tcdf, I had a problem called SYNTAX. How can I fix it?
• 99% of the time, a syntax error comes from a spelling mistake.
My guess is that you didn't write it exactly like Sal did. Maybe you missed a comma or a parenthesis, something like that.
• How can I solve the P value if I don't have a TCDF calculator?
I can't find the TCDf on the search engine, so I can't solve practice on Calculating the P - value in a test for a mean.
• I use NORMSDIST() to found the p-value having t in Spreadsheets, but it does not give me the same result as Sal. What am i doing wrong?
• `NORMDIST()` is appropriate for a NORMal DISTribution. Here we're dealing with a t distribution. In Google Sheets you can use `=T.DIST(-1.9,6,TRUE)` for a left-tailed t distribution, which gives `0.05308491335`.
(1 vote)
• okay so question: if you need to find P(t not equal to your t statistic) would you use tpdf and what you get from that and you subtract from 1 ??