Is this a Z-test or T-test?
The mean (?) temperature in Toronto in April is historically known to be 11ºC, with a population standard deviation of 5ºC. In order to determine if global warming affected the temperature this spring, researchers measured the temperature every day for the month of April (30 days). The mean temperature for the sample (????-bar) was 13ºC with a sample standard deviation (s) of 3ºC. Use the appropriate significance test to determine if temperature has significantly risen (gotten hotter) in Montreal. Use a one-tailed test, and an alpha (?) of .05.