Question

Evaluate the three survey designs below:

• A shopping mall that wishes to evaluate its image places packets including a questionnaire, cover letter, and stamped return envelope in the mall where customers can pick them up if they wish.
• An e-mail message is sent asking respondents to complete a questionnaire on a website. Respondents answer the questions and then have the opportunity to play a slot-machine game on the website. Each respondent is guaranteed a monetary incentive but has the option to increase it by repeatedly playing the slot-machine game.
• Time magazine opts to conduct a mobile-phone survey rather than mail survey for a study to determine the demographic characteristics and purchasing behavior of its subscribers in the United Kingdom, France and the United States.

Answer 1