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.
During the summer months, Alaska enjoys extended daylight hours in all parts of the state. In Barrow, Alaska's northernmost village far above the Arctic Circle, the sun doesn't set for 84 days! the state, the darkest hours of the summer night have the appearance of twilight.