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Construct a 95 confidence interval for the mean speed of

1. 100 cars on a thruway were clocked at an average speed of 69 m.p.h., with a standard deviation of 4 m.p.h. Construct a 95% confidence interval for the mean speed of all cars on this thruway.

2. A random sample of 4 students in a large statistics course received the following marks: 56, 70, 55, 59. Construct a 95% confidence interval for the average mark of all students in the course.

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