Many companies that manufacture lightbulbs advertise their 6

Many companies that manufacture lightbulbs advertise their 60-watt bulbs as having an average burn time of 1000 hours. A cynical consumer bought 30 bulbs and burned them until they failed. He found that they burned for an average of 1233 hours, with a standard deviation of 232.06. At an alpha level of 0.05, perfrom all six steps of hypothesis testing to determine whether the burn time of lightbulbs differs from that claimed by companies manufacturing them.

1) Population 1, population 2, what type of test should be conducted?

t critical, t statistic, cohen\'s d:, calculate 95% confidence interval

Solution