a brand of mobile battery It is advertised that it can be used for 48 hours if the battery is properly charged. According to a study of 5,000 properly charged batteries, 15 of them died 48 hours...

a brand of mobile battery It is advertised that it can be used for 48 hours if the battery is properly charged. According to a study of 5,000 properly charged batteries, 15 of them died 48 hours before. Support the claims of battery manufacturers? that the battery is more than 0.2% before 48 hours, test assumptions at the level of significance) 0.1