This investigation was concerned with acoustic measurements of the first two formants in four sustained vowels—/i/, /æ/, /a/, and /u/—produced by children at two different levels of linguistic development. The object of the investigation was to determine whether children of the same chronological age but at a different level of language development would exhibit significant differences of formant frequencies. Acoustic measurements of formants 1 and 2 of the four sustained vowels /i/,/æ/,/a/, and /u/ showed no statistically significant differences when produced by two groups of children at two levels of linguistic development. In each group, differences among formant measurements, for the four vowels, were significantly different.

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