The carbon monoxide (CO) level in a manufacturing plant is supposed to be about 50 parts per million (ppm). However the actual CO levels are quite variable. Ten CO measurements are taken at various...

The carbon monoxide (CO) level in a manufacturing plant is supposed to be about 50 parts per million (ppm). However the actual CO levels are quite variable. Ten CO measurements are taken at various times during the day: Test if the average carbon monoxide (CO) level is not 5 0 ppm at the manufacturing plant if the population standard is 8.07. Use 10% level of significance.