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8. Most owners of digital cameras store their pictures on the camera. Some will eventually download these to a computer or print them using their own printer or a commercial printer, A film processing company wanted to know how many pictures were stored on computers. A random sample of 10 digital camera owners produced the data given here, Estimate with 95% confidence the mean number of pictures stored on digital cameras. (10 points) 25, 22. 26, 31. IN, 20, 14, 9. The owner of a service station wants to determine if owners of new cars (two years old or less) change their cars' oil more frequently than owners of older cars (more than two years old). From his records he takes a random sample of ten new cars and ten older cars and determines the number of times the oil was changed in the last 12 months. The data follow, Do these data allow the service station owner to infer at the 10% significance level that new car owners change their cars' oil more frequently than older car owners? (10 points) (Assume Equal Variance in Tow Populations.) Dangereng of Oil Changes in Fest 12 Months New Car Oupen