Instruction 8-6 a Sample of Salary Offers (In Thousands of Dollars)given to Dollars)given

Instruction 8-6
A sample of salary offers (in thousands of dollars)given to students majoring in management is: 28,31,26,32,27,28,27,30,31,and 29.Using this data to obtain a 95% confidence interval resulted in an interval from 27.5 to 30.3.
-Referring to Instruction 8-6,the confidence interval obtained is valid only if the distribution of the population of salary offers is normal.