The scores on the Psychomotor Development Index (PDI), a scale of infant development, have a normal population
Question:
a. Find the z -score for a PDI value of 90.
b. A study uses a random sample of 225 infants. Using the sampling distribution of the sample mean PDI, find the z -score corresponding to a sample mean of 90.
c. Explain why a PDI value of 90 is not surprising, but a sample mean PDI score of 90 for 225 infants would be surprising.
Distribution
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a z 90 10015 067 b z 90 10015225 10 c For an individual PDI ...View the full answer
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Related Book For 
Statistics The Art And Science Of Learning From Data
ISBN: 9780321755940
3rd Edition
Authors: Alan Agresti, Christine A. Franklin
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