Average service time before the pandemic was 9 min. A sample of 100 service times after the pandemic was collected, reporting a sample mean = 12 min with a standard deviation = 2 min. Would you conclude that service time has increased after the pandemic? Assume a p-value = 0.21 and alpha 0.05. Based on the given p-value, what is your conclusion?

a) Reject Ho. Conclusion "service time has not increased"

b) Reject Ho. Conclusion "service time has increased"

c) Do not reject Ho. Conclusion "service time has not increased"

d) Do not reject Ho. Conclusion "service time has increased"