Until now it was observed that the population mean waiting time to check out of a supermarket is at least 4 minutes. However, because of the holiday season, in an effort to reduce the mean waiting time, the supermarket has experimented with a system in which infrared cameras use body heat and in-store software to determine how many lanes should be opened. A sample of 101 customers was selected, and their mean waiting time to check out was found to be 3.25 minutes, with a sample standard deviation of 130 seconds.

1. Using the critical value approach is there any evidence that the effort to reduce the mean waiting time is successful?

2. Determine the p-value and interpret its meaning.