Diffusion and solubility of gases (b. flaconn'eche, et al., oil and gas science and technology, 2001: 262-278) reported on a study of the effect of temperature and other factors on gas transport coefficients in semi crystalline polymers. the permeability coefficient (in 10-6 cm3 (stp)/cm. s. mpa) of co2 was measured for extruded medium density polyethylene at both 60 degree c and 61 degree c. the results are as follows:
60⁰ c54516167576960606362
61⁰ c586086160

(1) find mean of 60 degree sample to nearest 0.1
(2) find mean of 61 degree sample to nearest 0.1
(3) find sample standard deviation of 60 degree sample to nearest 0.01
(4) find sample standard deviation of 61 degree sample to nearest 0.01
(5) what are the degrees of freedom?
(6) center of confidence interval? (7) width of confidence interval (remember to multiply by 2? )
(8) if everything was the same except that we had one more sample in each group, would the above confidence interval get longer or shorter or stay the same?