7-

Home Depot wants to know how long the average light bulb lasts. They sample 3,500 families in the United States. Based on past studies the population standard deviation is assumed known to be 400 hours. You calculate the sample mean to be 1,800 hours. What is the correct interpretation of the 98% condence interval estimate? 0 The population mean hours a light bulb lasts in the United States will be within the interval 1,784 hours to 1,815 hours 98% of the time Q You are 98% condence that the hours a light bulb lasts in the United States is within the interval 1,784 hours to 1,815 hours Q You are 98% condent that the sample mean hours a light bulb lasts in the United States is within the interval 1,784 hours to 1,815 hours 0 You are 98% condent that the population mean hours a light bulb lasts in the United States is within the interval 1,784 hours to 1,815 hours