3. In a survey of 500 residents of Saskatoon, 300 were opposed to the use of photo-radar for issuing traffic tickets. Let p be the proportion of all Saskatoon residents opposed to photo-radar.

a) Find the margin of error that corresponds to a 90% confidence interval for the proportion (p) of all Saskatoon residents opposed to photo-radar. ( 2 marks)

b) State the 90% confidence interval for the population proportion who are opposed to the use of photo-radar. Do the majority of Saskatoon residents oppose the use of photo-radar? (4 marks)