Mitchell Jordan

Mathematics

8 May, 11:19

Just Checking

2. A consumer watchdog organization received customer complaints about

the performance of one brand of batteries. To investigate, the researchers

purchased 24 of these batteries and ran them until they died. This sample

lasted a mean of 47 hours with a standard deviation of 3 hours.

a) What assumption must we make about battery life in order to use a t

model?

b) Find a 95% confidence interval for the mean lifespan of this brand of

batteries.

c) Write a conclusion based on your confidence interval.