In the past, the mean on-line waiting time to purchase certain playoff tickets has been at least10.80 minutes. Recently the site has experimented with a new system having multiple servers. A sample of 70 customers using this system had a mean time of 9.40 minutes with a standard deviation of 6.5 minutes. At the 0.05 level of significance, is there evidence to suggest that the new waiting time to purchase tickets with the new system islessthan 10.80 minutes?

Step 3

Z test statistics (using the formula)= ____________ , ____________

We ____________ Ho,conclude that there ____________ evidence that the new waiting time to purchase tickets with the new system is less than 10.8minutes with 0.05level of significance.