Statistics
STAT → TESTS → T-Test; choose Data, enter L1 and L2, select two-sided, then compute because LinRegTTest is only for correlation coefficient rho and not slope.
2nd → LIST to paste the regression equation into a function; press CALC to run LinRegTTest automatically without setting lists because the calculator detects data location automatically.
STAT → EDIT to ensure L1 contains x and L2 contains y; STAT → TESTS → LinRegTTest; set Xlist: L1, Ylist: L2, Freq: 1, Alternative: ≠; then Calculate.
STAT → EDIT put x in L2 and y in L1 because TI-84 expects y first; then STAT → TESTS → LinRegTTest, Xlist L2, Ylist L1, Freq: n, Alternative: >; then Calculate.