4. Im conducting a study about the heights and weights of Rutgers undergraduates. To do this, I send out a survey by email to 500 randomly selected undergraduates and ask them for both their height and their weight. (a) ( 2 points) After collecting my data, I find that only 152 of the people in my sample returned the survey. Do you think the topic of the survey contributes to the non-response? What about the method of survey distribution? (b) ( 1 point) In addition, a large proportion of those who responded gave their weights in multiples of 5 (e.g., 165, 170, 185). Can you identify what might be happening here?

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(a) The survey topic might make people uncomfortable sharing personal information, leading to lower response rates. Email distribution might also contribute to non-response. (b) Respondents might be rounding their weights to multiples of 5 due to sensitivity or using a mental shortcut.

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