Which of the following is NOT an example of a sample that is too narrow?

The reasoning behind the correct choice focuses on the inclusivity and representativeness of the sample. An online only sample for a web-based retailer asking about past website buying habits can be considered appropriate and not overly narrow because it targets a specific population that is likely familiar with the retailer’s online shopping experience. This approach leverages the context of the web-based retailer, ensuring that respondents possess relevant experience to provide valuable insights into their buying habits.

In contrast, other options demonstrate a lack of broader representation. For example, an online only sample for a B2B company asking about buying habits may exclude critical insights from businesses that do not operate exclusively online, limiting the understanding of buying habits across varied business models. Similarly, an online only survey of adults aged 25-54 regarding online streaming usage excludes younger and older demographics, potentially omitting user behaviors and preferences that could enrich the data pool. The telephone survey option is broader, but if restricted to only adults aged 18+, it still does not capture the full spectrum of buying habits across all age groups.

Thus, the distinction lies in how the sample is constructed and who it aims to include, with option D adeptly targeting a relevant user base without significant exclusion.