Question

select the correct answer. energized and powercell are companies that manufacture alkaline batteries. both companies claim that their batteries last longer than the average alkaline battery. anju decided to conduct a test to see whether their claims were true. he purchased 30 energized batteries, 30 powercell batteries, and batteries of other brands to conduct the test. the purchase selection was random, and the test was unbiased. the batteries that lasted longer than the average of all the batteries were stated to have passed the test. the batteries that did not last as long as the average of all the batteries were stated to have failed the test. the results for energized and powercell are displayed in this table.

	energized	powercell
failed	7	10

what can be concluded from the results of anjus test?
a. both manufacturers claims are true because most of their batteries lasted longer than the average alkaline battery.
b. the energized companys claim is true because a greater number of energized batteries passed the test.
c. both manufacturers claims are false because some of their batteries failed the test.
d. powercells claim is false because fewer of its batteries passed the test than energized batteries.

Explanation:

For Energized, 23 out of 30 passed the test (more than half). For Powercell, 20 out of 30 passed the test (also more than half). Since passing means lasting longer than the average alkaline battery, most of their batteries met this criterion.

Answer:

A. Both manufacturers' claims are true because most of their batteries lasted longer than the average alkaline battery.