# Question: in a recent year the better business bureau settled 75...

###### Question details

In a recent year, the Better Business Bureau settled 75% of
complaints they received. (Source: USA Today, March 2, 2009) You
have been hired by the Bureau to investigate complaints this year
involving computer stores. You plan to select a random sample of
complaints to estimate the proportion of complaints the Bureau is
able to settle. Assume the population proportion of complaints
settled for the computer stores is the 0.75, as mentioned above.
Suppose your sample size is 143. What is the probability that the
sample proportion will be within 9 percent of the population
proportion?

Note: You should carefully round any z-values you calculate to
4 decimal places to match wamap's approach and calculations.