4. In an independent samples study, the mean (1) for Sample 1 is 39 (N1 = 10) and the mean (X2) for Sample 2 is 31 (N2 = 10). The estimate of the standard error (the error estimate) is 2.45. Calculate the degrees of freedom (df) _____ , compute tobs ______, find tcritical ____ (for a two-tailed test, p is set at less than .05).

Based on the information for #4, the logic dictates a decision to:...

a. reject the null hypothesis (Ho: H1 = 42)

b. fail to reject the null hypothesis (Ho: H1 = 42)