The Claim of the Manufacturer of Cell Phone Batteries Is

Multiple Choice

The claim of the manufacturer of cell phone batteries is that the median life of a battery is more than 40 hours.Suppose a random sample of 75 batteries finds that 32 have a life of more than 40 hours.Does the evidence support their claim? Which is the corresponding test statistic result?

A) -1.39
B) 1.96
C) -1.96
D) 1.39
E) 1.55