In each parts a-c we have given a likely range for the observed value of a sample proportion. based on the given range, identify the educated guess that should be used for the obseved value of sample proportion to calculate the required sample size for a perscribed confidence level and margine of error.
a) 0.4 to 0.7b) 0.7 or greaterc) 0.7 or less
d) in each parts a - c, which observed values of the sample proportion will yield a larger margin of error than the one specified if the educated guess is used for the sample size computation?

i do not have a clue where to start. i am lost.