The research and development department of an appliance comp

The research and development department of an appliance company suspects the energy consumption required of their 18-cubic-foot refrigerator can be reduced by a slight modifi- cation to the current motor. Sixty 18-cubic-foot refrigerators were randomly selected from the company’s warehouse. The first 30 had their motors modified while the last 30 were left intact. The energy consumption (kilowatts) for a 24-hour period for each refrigerator was recorded and stored in the data frame REFRIGERATOR. Is there evidence that the design modification reduces the refrigerators’ average energy consumption (describe all steps for the test)?

Solution

Yes, there is evidence that the design modification reduces the refrigerators average enery consumption