It is known that the median starting salary for the population of finance graduates in the United Kingdom is £20,000. For the same random sample of 25 Sussex graduates as in part (b), three were found to have a starting salary equal to £20,000 and 12 a starting salary above this value. Use a significance level of 0.05 to test whether or not the median starting salary for the random sample of Sussex graduates is equal to
£20,000.