to view the statistics calculation options.
.
Press 
to select one-variable statistics.
Press 
to select two-variable statistics.
Press 
to select median-median
which finds the equation of the median-median line of the form y = ax +
b.
Press 
to select linear
regression which finds the best-fit linear equation of the form y =
ax + b.
Press 
to select quadratic
regression which finds the best-fit quadratic equation of the form
y = ax2 + bx + c.
Press 
to select cubic
regression which finds the best-fit cubic equation of the form y =
ax3 + bx2 + cx + d.
Press 
to select quartic
regression which finds the best-fit quartic equation of the form y
= ax4 + bx3 + cx2 + dx + e.
Press 
to select linear
regression which finds the best-fit linear equation of the form y =
a + bx.
Press 
to select logarithmic
regression which finds the best-fit logarithmic equation of the form
y = a + b ln x.
Press 
to select exponential
regression which finds the best-fit exponential equation of the form
y = abx.
Press A (
)
to select power
regression which finds the best-fit power equation of the form y =
axb.
Press B ( 
)
to select logistic which finds the best-fit logistic equation of the form
y = c/(1 + ae-bx).
Press C ( 
)
to select sin regression which finds the best-fit periodic equation of
the form y = a sin(bx + c) + d.