In a study of mother2infant interaction, mothers are rated by trained observers on the quality of their interactions with their infants. Mothers were classified on the basis of whether this was their first child (primiparous versus multiparous) and whether the infant was low-birthweight (LBW) or full-term (FT). (Full-term generally means normal birth weight.) The data represent a score on a 12-point scale, on which a higher score represents better mother2infant interaction.

Run and interpret the appropriate analysis of variance.

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Primip/LBW 6 5 5 4 9 6 26 5 5 Primip/FT Multip/LBW 7 8 8 9 82 1 9 9 8 Multip/FT 9 8 9 9 3 10 9 87 10