A bank found that in recent years, the average monthly charge on its credit card was
$1,450.
With an improving economy, they suspect that this amount has increased. A sample of
45
customers resulted in an average monthly charge of
$1,476.84
with a standard deviation of
$183.43.
Do these data provide statistical evidence that the average monthly charge has increased? Formulate the appropriate hypothesis test and draw a conclusion. Use a level of significance of 0.05. using a level of significance of 0.05, what is the critical value