A random sample of eight business transactions was selected from a large number of such transactions. The degrees of freedom (ν ) and the critical value (cv) using the t-distribution for the 95 per cent confidence interval would be:
a. ν = 7 and cv = 1.895
b. ν = 8 and cv = 1.860
c. ν = 7 and cv = 2.365
d. ν = 6 and cv = 2.447