Select the type of sample that has been formed in each presented situation: simple random sample stratified random sample voluntary response sample a) a company is investigating working conditions throughout their operations and has offered employees the opportunity to complete a questionnaire on this subject. b) the island nation of south nakaratu is planning for development of their public transport system. in order to with this, 200 randomly selected citizens of the country are chosen from the general population and are required to complete a survey relating to their use of public transport and desired changes. c) it is suspected that a new medical treatment for influenza may affect men and women differently. a group of 30 males is randomly selected and a group of 30 women is randomly selected. the treatment is then applied