Question

Average monthly salary in a certain profession was investigated. The poll was answered by 220 persons, whose average salary was 3100euro. The sample standard deviation was 470 euro which is assumed to be equal to the population standard deviation. Using the results, determine the 92 % condidence interval for the mean salary. Give the limits of the confidence interval by accuracy of one euro, rounding them to the closest value. It's important to solve the problem assuming equality of sample standard deviation and population standard deviation, when normal distribution can be used to calculate the margin of error.

Answer 1