1.A newly hired manager of a company that provides cell phone service wants to determine the percentage of adults in his state who live in a household with cell phones and no land-line phones.How many adults must he survey?Assume he wants to be 90% confident that the sample percentage is within 4 percentage points of the true population percentage.

a.Assume that nothing is known about the percentage of adults who live in a household with

cell phones and no land-line phones.Sample size = _________________________________

b.Assume that a recent survey suggests that about 8% of adults live in a household with cell

phones and no land-line phones.Sample size = ____________________________________

c.Why is that the case? Write one sentence explain the phenomenon.