A friend of mine studies the effects of praise on happiness. She believes that c

Question

A friend of mine studies the effects of praise on happiness. She believes that children who receive praise are happier overall than children who do not receive praise. She measures happiness by counting the number of times a child smiles in a one hour period. She knows that in the population of children who do not receive praise smiles average 4 times per hour with a standard deviation of .5, and that these data are normally distributed. She selects a sample of 100 children whom she knows receive praise and finds that they smile an average of 3.5 times per hour. The characteristics of the appropriate comparison (sampling) distribution are

Explanation / Answer

The characteristics of the appropriate comparison (sampling) distribution are

average or mean is 4

SD = 0.5 / srqt (100) = 0.05

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