A public health official in Jordan suspects that the mean hemoglobin level for all children is less than 12 grams. He took a random sample of 50 children and found x̄ = 11.5 g/dl and s = 1.6 g/dl. Based on this information, What is the null hypothesis?
1) The mean hemoglobin level for all children is equal to 12 grams
2) The mean hemoglobin level for all children is greater than 12 grams
3) The mean hemoglobin level for all children is less than 12 grams
4) The mean hemoglobin level for all children cannot be determined
