A law enforcement agent believes that at least 84% of the dr…

A law enforcement agent believes that at least 84% of the drivers stopped for speeding on Saturday nights are under the influence of alcohol. A sample of 84 drivers who were stopped for speeding on a Saturday night was taken. Seventy-five percent of the drivers in the sample were under the influence of alcohol.

A tire manufacturer has been producing tires with an average…

A tire manufacturer has been producing tires with an average life expectancy of 27,000 miles. Now the company is advertising that its new tires’ life expectancy has increased. To test the legitimacy of the advertising campaign, an independent testing agency tested a sample of 6 of their tires and has provided the following data.  Use the 0.01 level of significance . Life Expectancy(In Thousands of Miles) 31 29 26 30 32 26