Question

Frozen batteries Will storing batteries in a freezer make them last longer? To find out, a company that produces batteries takes a random sample of 100 AA batteries from its warehouse. The company statistician randomly assigns 50 batteries to be stored in the freezer and the other 50 to be stored at room temperature for 3 years. At the end of that time period, each battery’s charge is tested. Result: Batteries stored in the freezer had a significantly higher average charge. What conclusion can we draw from this study? Explain your reasoning.

Short answer

When batteries are stored in colder conditions like in a freezer they do retain their charges for a longer period of time but it is not applicable to every kind of battery.

Step-by-step solution

Given Information

Total no. of batteries taken as a sample were $100$.

No. of batteries stored in the freezer were $50$and same as that of batteries stored outside.

The time duration was taken as$3$years.
observations were recorded accordingly after testing each battery at the end of the time period.

Explanation 

When we store the Batteries of the type used in the survey in colder conditions, it was observed that they retained their charge for a longer period than normal batteries. Though this conclusion can not be drawn for other types of batteries primarily those batteries which are in active use. Also, some types of batteries that include AAA vs AA, dry cell vs lithium-ion, etc., do not give results in favor of the observation.