What question did this study set out to answer?

To compare subjective quality of line-interlaced and noninterlaced television pictures in terms of bandwidth efficiency and visual equivalency.

Low-Resolution TV: Subjective Comparison of Interlaced and Noninterlaced Pictures

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Subjective comparison evaluates bandwidth in line-interlaced versus noninterlaced TV pictures, indicating implications for visual quality.

To compare subjective quality of line-interlaced and noninterlaced television pictures in terms of bandwidth efficiency and visual equivalency.
Compared line-interlaced and noninterlaced pictures with various factors like noise and luminance
Used head-and-shoulder view of a model for visual assessment
Analyzed effects of line-width to line-pitch ratio on perceived quality
Line-interlacing provided approximately 37% bandwidth saving at 40 fL luminance and only 6% at 100 fL
Significant quality difference noted when luminance decreased from 60 fL to 40 fL
Effects of noise, spot-wobble, and illumination did not significantly alter subjective equivalence of picture types.

Earl F. Brown (1967) studied this question.

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Subjective comparison evaluates bandwidth in line-interlaced versus noninterlaced TV pictures, indicating implications for visual quality.