Restaurant chain A claims that the waiting time of customers for
service is normally distributed, with a mean of 3 minutes and a
standard deviation of 1 minute.  The quality assurance department
found in a sample of 50 customers at the franchise that the waiting
time was 2.75 minutes.
 
At the .05 significance level, can we conclude that the mean waiting
time is less than 3 minutes?
 
 
State the following to earn points for this test:  Be specific in your answers. 
What is the null hypothesis?  
What is the alternative hypothesis? 
What is the level of significance sought? 
What is the test statistic?  
What is the decision rule? 
What is your decision?