Karen wants to advertise how many chocolate chips are in each Big Chip cookie at her bakery. She randomly selects a sample of 31 cookies and finds that the number of chocolate chips per cookie in the sample has a mean of 12.8 and a standard deviation of 2.9. What is the 95% confidence interval for the number of chocolate chips per cookie for Big Chip cookies? Enter your answers accurate to one decimal place (because the sample statistics are reported accurate to 2 decimal place).

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