Engineers investigated the impact of a newly developed hydrophobic nano-coating on the surface drag coefficient (CdC_dCd) of autonomous underwater gliders.
Gliders treated with the nano-coating were tested in a high-precision flow tank 15 times (n1=15n_1 = 15n1=15). A control group of identical gliders without the coating was tested under the same experimental conditions 13 times (n2=13n_2 = 13n2=13).
The mean drag coefficients recorded under each condition were:
State the statistical test that should be used to compare the means of these two groups, and calculate the degrees of freedom (df\text{df}df) for this test.
The statistical test was performed, yielding a ppp-value of p<0.05p < 0.05p<0.05. Using the words probability, chance, and significant, draw a scientific conclusion from this result.
