P-value from tstat. A one-sample t statistic for H0: µ = 0 based on n = 16 is tstat = 2.44. (A) How many degrees of freedom for the test statistic? (B) Provide the t values from the t table that bracket the tstat. (C) What is the approximate one-sided P-value for this problem? (E) What is the two-sided P-value? Solution (A) How many degrees of freedom for the test statistic? degrees of freedom=n- 1=16-1=15.