The average depth of the Hudson Bay is 315 feet.

Last updated: 7/28/2022

The average depth of the Hudson Bay is 315 feet. Climatologists were interested in seeing if warming and ice melt were affecting the water level. 70 measurements over a period of randomly selected weeks yielded a sample mean of 317.5 feet. The population variance is known to be 4.3. Can it be concluded at the 0.05 level of significance that the average depth has increased? Find the test statistic. Round your answer to 2 decimal places.