Can you please explain the steps for working thru this?

A large health care system gave all nurses a flat wage increase. A union representative sampled 50 nurses and found that the mean increase in total wages was 5.2% with a standard deviation of 1.61.

Using a 95% confidence interval, which statement from the union best describes the wage increase for all nurses in the system?

The average wage increase for nurses in the system was5.2%.

The average wage increase for nurses in the system wasbetween 3.6% and 6.8%.

The average wage increase for nurses in the system was5.205%.

The average wage increase for nurses in the system was between 4.76% and 5.65%.