To the nearest percent, with a confidence level of 95% (z*-score 1.96), what is the confidence interval for the proportion of cable subscribers who would be willing to pay extra for the new nature channel? e = z* and c = e
a) Between 10% and 39%
b) Between 29% and 49%
c) Between 31% and 47%
d) Between 38% and 40%