QUESTION 1

In the past, the mean on-line waiting time to purchase certain playoff tickets has been at least 10.80 minutes. Recently the site has experimented with a new system having multiple servers. A sample of 24 customers using this system had a mean time of 9.9 minutes with a standard deviation of 2.14 minutes. Test, at the 0.05 level of significance, whether the waiting time to purchase tickets with the new system is less than 10.80 minutes?

Whatis your calculated t? (Round to 3 decimal places.)

QUESTION 2

A test is done to compare the mean life of two different batteries. A sample of 40 batteries from Brand A showed a mean life of 367 hours with a standard deviation of 24 hours. A sample of 55 batteries from Brand B showed a mean life of 353 hours with a standard deviation of 28 hours. Test at the 0.05 level of significance whether there is a difference in the mean life between the two batteries.

(Remember to designate which Brand is Population 1 and which Brand is Population 2)

What is your calculated z? (Round to two decimal places).