A marketing manager wanted to know if the number of successful sales calls was really different in two large markets.In one market, the number of sales calls averaged 80 per month for the 200 salespeople with a standard deviation of 20. In the other market, the sales calls averaged 82 for 200 salespeople with a standard deviation of 25. Is there a significant difference between the two markets? Use 95% significance or z = 1.96 when not provided.