QuestionWe poll 450 people and find that $40 \%$ favor Candidate S. In order to estimate with $90 \%$ confidence the percent of ALL voters would vote for Candidate S, we should use: 2-SampZInt 2-PropZInt TInterval 1-PropZInt 2-SampTInt ZInterval

Studdy Solution
Justify the choice based on the problem's requirements.
Since we are dealing with a single sample proportion (40% of 450 people favor Candidate S) and want to estimate the proportion of all voters with a 90% confidence level, the "1-PropZInt" is the correct choice. Other options such as "2-SampZInt", "2-PropZInt", "TInterval", "2-SampTInt", and "ZInterval" are used for different types of data or comparisons.
The correct method to use is:
$$\boxed{\text{1-PropZInt}}$$