Psychologists have found that twins, in their early years, tend to have lower IQs and pick up
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Psychologists have found that twins, in their early years, tend to have lower IQs and pick up language more slowly than non-twins. The slower intellectual growth of most twins may be caused by benign parental neglect. Suppose it is desired to estimate the mean attention time given to twins per week by their parents. A sample of 50 sets of 2y2-year-old twin boys is taken, and at the end of 1 week, the attention time given to each pair is recorded. The data (in hours) are listed in the following table and saved in the ATTIMES file. Find a 90% confidence interval for the mean attention time given to all twin boys by their parents. Interpret the confidence interval.
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