In a sample of 16 sales calls employee A closed the contract for an average value of 1800 TL with a standard deviation of 100 TL. Company policy requires that new members of the sales team must exceed an average of 1750 per contract during the trial (probation) employment period. a) Can we conclude that employee A has met this requirement at the significance level of 95%?

b) What about if the significance level is 90%?

c) What is the conclusion in a) if the sample of calls becomes 144? The average and standard deviation remain the same at 1800 and 100 TL respectively.