For the following data:

Please calculate the t-value, including every step (manually), as well as the critical value for a two-tailed test of significance with an alpha value of 0.05.

Mobility	Log-Density
Sedentary	0.592177
Sedentary	0.887054
Mobile	0.117271
Mobile	0.673021
Mobile	-0.29243
Mobile	-0.50864
Mobile	1.453471
Mobile	0.863917
Sedentary	1.176381
Sedentary	0.580925
Mobile	0.004321
Mobile	0.344392
Mobile	0.448706
Mobile	-0.21467
Mobile	-0.38722
Sedentary	0.820201
Mobile	0.232996
Mobile	-0.29243
Mobile	0.149219
Sedentary	0.881385
Mobile	1.176381
Mobile	1.127429
Mobile	0.634477
Sedentary	1.541704
Sedentary	1.521269
Sedentary	1.360025