Torres Electronics Wants to Estimate the Average Years of Seniority

Torres Electronics wants to estimate the average years of seniority for employees working for the company.The files of 49 workers are selected at random.Average seniority for those in the sample is 13.6 years.Assume you know the population standard deviation is 5.2 years.You proceed to construct a 95% confidence interval estimate of average seniority for the full population of company employees.Which, if any, of the following factors would cause you to change the upper and lower bounds by more than 1/10 of a year for the interval you would produce in the situation described above? (Consider each factor independent of the others.)

A) The standard deviation of the seniority distribution for the population of company employees is unknown, but the sample standard deviation is 5.2 years.
B) The shape of the seniority distribution for the population of company employees is decidedly not NORMAL.The population size is 10,000.
C) The size of the company employee population is known to be 5000.
D) The size of the company employee population is known to be 100.
E) None of the factors would cause a change larger than 1/10 of a year.