# How to find p value without standard deviation

We can find t for P-Value. To derive t from r the formula t= (r*sqrt (n-2))/ (sqrt (1-r^2) Now, suppose n (no. Of observation) is 10 and r= From the above image, we have found t = Now to assess the significant value associated with t, simply use the TDIST function.

**Calculating a P-value given a z statistic - AP Statistics - Khan Academy**

Step 4bP-value approach: Determine the p-value. Step 5aCritical value approach: If the value of the test statistic falls in the rejection region. The p-value is the probability of rejecting a correct H 0. When the p value is small, the probability of rejecting a correct H 0 is small, hence the probability for a mistake is small. P value formula. X is the test statistic value, and you know the distribution of X. For example X may be Z, T etc. Left tailed: P-value = p(x≤X) Right tailed: P-value = 1 - p(x≤X).

Jan 22, · t = (x-μ) / (s/√n) where x is the sample mean, μ is the hypothesized mean (in our example it would be 15), s is the sample standard deviation, and n is the sample size. Once we know the value of t, we can use statistical software or an online calculator to find the corresponding p-value.

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Clearly, thanks for the help in this question.

Very curiously :)