t-Test. Papers Introduction to the t-Test (University of Leicester) Describes the conditions that must be met in order to use of the test.Z-test and t-test are basically the same, they compare between two means to suggest whether both samples come from the same population.
Anchorage gets 22 hours of daylight on the longest day of summer. On the shortest day of winter, there are still seven and a half hours of daylight.
The further north a location is in Alaska, the more time of darkness there is during the winter. On the shortest day of winter, Juneau gets 6 hours and 22 minutes of sunlight. Anchorage gets about 5 hours and 28 minutes of sun and Fairbanks gets 3 hours and 42 minutes of sunlight on the winter solstice.