To determine the least number of people Mickey should include in her survey, we can use a common approach to sampling which involves the concept of statistical significance. Generally, a common rule of thumb for survey sampling is to use 10-15% of the total population, depending on desired accuracy and confidence levels.
If we assume a conservative approach using 10%, we can calculate:
\[ \text{Sample size} = 450 \times 0.10 = 45 \]
Alternatively, for a better confidence interval, some researchers might suggest a higher percentage, but 10-15% is often sufficient for general surveys.
Thus, the least number of people Mickey should include in her survey could be around 45 to 68 members (10-15% of 450).
However, if this is a general opinion poll and just a rough estimate without intricate statistical calculations, aiming for around 50 members could be a reasonable, practical target.