Question
In a sample of 77 children, the mean age at which they first began to combine words was 16.5 months, with a sample standard deviation
In a sample of 77 children, the mean age at which they first began to combine words was 16.5 months, with a sample standard deviation of 9.6 months. Compute a 90% confidence interval for the mean age at which children first begin to combine words.
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Understanding Public Opinion Polls
Authors: Jelke Bethlehem
1st Edition
1498769756, 9781498769754
