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Dylan Jones kept careful records of the fuel efficiency of his new car

Dylan Jones kept careful records of the fuel efficiency of his new car. After the first eleven times he filled up the tank, he found the mean was 27.3 miles per gallon (mpg) with a sample standard deviation of 1.3 mpg. (Use t Distribution Table.) Compute the 95% confidence interval for his mpg. (Round your answers to 3 […]

Pharmaceutical companies promote their prescription drugs using television advertising

Pharmaceutical companies promote their prescription drugs using television advertising. In a survey of 120 randomly sampled television viewers, 12 indicated that they asked their physician about using a prescription drug they saw advertised on TV. Develop a 90% confidence interval for the proportion of viewers who discussed a drug seen on TV with their physician. (Round […]