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1. A statistician is interested in the gross earnings of several of her favorite bands. She...

1. A statistician is interested in the gross earnings of several of her favorite bands. She took a random sample of 30 concerts in the USA, and found that the gross earnings averaged $2.27 million with a standard deviation of $0.5 million. Compute and interpret the 99%confidence interval for the mean gross earnings of these concerts.

5. A survey was conducted about the cost for a family of four to visit an amusement park for one day. A sample of 32 families yielded an average cost of $190.28 with a standard deviation of $51.75. Find the 90% confidence interval for the true average cost for a family of four to visit an amusement park.

7. According to a large local high school, senior students have a mean GPA of 3.07. A random sample of 38 seniors taking AP courses showed a mean GPA of 3.29 with a standard deviation of .42. Find the 95% confidence interval for the mean GPA of all senior students enrolled in AP courses.

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