A pediatrician finds that the mean age at which the children who visit her first walk alone is 15 months. She notices that the children from a neighboring town seem to start walking alone at an earlier age. She selects a random sample of 30 kids from this town and finds that the mean age at which they first walk alone is 13.5 months, with a standard deviation of 6 weeks. She wants to know if this group of children is significantly different from all those who visit her. What test should she use?
What will be an ideal response?
Correct Answer:
t- test for a single mean - pop sigma is not given
Education
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