A technology company claims that a new smartphone battery lasts an
average of 24 hours on a single charge under normal usage conditions. A
consumer advocacy group suspects that the actual average battery life is
less than what the company claims and decides to test this assertion.
Suppose the company provides the data below:
Sample Size (n): 40
Sample Mean ( x‾ ): 23.1 hours
Sample Standard Deviation (s): 2.13 hours
Conduct a one-sample t-test to determine if the actual average battery life
is less than the claimed 24 hours. Test at the =.05 significance level.