A researcher knows that “maternal attachment” (MA) scores of 18 month old toddle

Question

A researcher knows that “maternal attachment” (MA) scores of 18 month old toddlers who were breastfed is normally distributed with = 7.5 and = 1.2. High scores indicate greater maternal attachment with the MA test; the maximum score is 10. She speculates that 18 month old toddlers who are not breastfed will differ in terms of their MA scores from those who were breastfed. With a sample of N = 20 non- breastfed toddlers, the researcher obtained the MA scores below.

MA scores of non- breastfed toddlers: 8, 5, 4, 3, 7, 2, 3, 7, 9, 4, 6, 8, 2, 8, 8, 9, 6, 7, 7, 5

Is this a one-tailed HA or a two-tailed HA ?

Explanation / Answer

Since, She speculates that 18 month old toddlers who are not breastfed will differ in terms of their MA scores from those who were breastfed she is not talking about a direction i.e greater or smaller. therefore it is a two tailed test

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