to-evaluate-battery-life-between-two-types-of-wireless-headphones-a-technician-t

Question

To evaluate battery life between two types of wireless headphones, a technician tests $20$ units of Brand A and $25$ units of Brand B.

Brand A has a mean battery life of $18.2$ $hours$ with a known population standard deviation of $1.5$ $hours$ .

Brand B has a mean battery life of $17.5$ $hours$ with a known population standard deviation of $1.8$ $hours$ .

At the $alpha equals 0.05$ level of significance, can the technician conclude that there is a significant difference in the average battery life between the two brands?

Accepted Answer

There is insufficient evidence to conclude that the average battery life differs between brand A and brand B.

Answer

There is sufficient evidence to conclude that brand A has significantly higher battery life than brand B.

Answer

There is sufficient evidence to conclude that brand B has significantly higher battery life than brand A.

Answer

Insufficient data.