Thats my thoughts anyway1. An agency is employed to collect data regrading the use of public transport in Adelaide. The agency places an employee at each of the city bus stops between the hours of 8:00 am and 9:00 am each day for one week. Members of the public are asked, "How frequently do you use public transport?"
(a) Describe the population.
The population is probably the population of Adelaide or all of the people who use public transport in Adelaide.
(b) Would you expect the results to contain bias? Give reasons for your answer and state the likely effect.
There is a definate bias as by placing researchers at bus stops the only people contributing to the data are people who use the bus.
(c) Outline a better sampling technique.
To increase the chances of an unbiased sample a mail shot questionaire to a randomly chosen sample of Adelaide residents would be favourable.