You are the quality control manager in a bakery. One of the products is a chocolate chip cookie that should contain an average of 18 chocolate chips (standard deviation = 1.5). Chocolate chips are expensive, but also important for customer satisfaction. One bag (36 cookies) from each production run is analyzed to ensure that the cookies have enough chocolate chips to meet customer expectations, but not so many that profits are reduced. Standard operating procedures require a Z test with an alpha level of 0.05. What results would indicate production should be halted?

1. a sample mean less than 17.59
2. a sample mean less than 17.51 or greater than 18.49
3. a sample mean less than 17.75 or greater than 18.25
4. a sample mean greater than 18.41