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Chapter 2: Problem 27

Whether or not to continue a Mardi Gras Parade through downtown San Luis Obispo, CA, is a hotly debated topic. The parade is popular with students and many residents, but some celebrations have led to complaints and a call to eliminate the parade. The local newspaper conducted online and telephone surveys of its readers and was surprised by the results. The survey web site received more than 400 responses, with more than \(60 \%\) favoring continuing the parade, while the telephone response line received more than 120 calls, with more than \(90 \%\) favoring banning the parade (San Luis Obispo Tribune, March 3, 2004). What factors may have contributed to these very different results?

Short Answer

Expert verified
The factors contributing to the different results could include the demographics of the people who responded (younger people may be more likely to participate in an online survey and favor the parade; older people may be more likely to respond to a phone survey and disfavor the parade), the sample size difference (online survey had more respondents), and self-selection bias inherent in both surveys.

Step by step solution

01

Consider the two formats of survey

Two methods were employed for this survey: a web-based platform received more than 400 responses, and a telephone line collected more than 120 responses. It is known that over \(60 \%\) of online responses were in favor of the parade, whereas over \(90 \%\) of telephone responses favored banning the parade.
02

Consider the demographics that might use each method

The respondents to each of the two survey methods are likely to belong to different demographic groups. Internet-related activities, such as online polls, are more frequently used by younger individuals, who might be more inclined to keep the parade. On the other hand, older individuals, who might be more likely to oppose the parade, could have been the main respondents to the telephone survey.
03

Consider the potential bias

Survey respondents are self-selected, therefore the data may not represent the entire population of San Luis Obispo. Moreover, it's possible that those with stronger feelings about the issue were more likely to respond to the surveys, therefore leading to potential bias in the survey results.
04

Consider the sample size

The survey conducted online had a larger sample size than the phone survey. A smaller sample size, like the phone survey, may not represent the entire population's opinion as accurately as a larger sample.

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