O Points: 0 of 1 Save n Country A, the population mean height for 3-year-old boys is 39 inches. Suppose a random sample of 15 3-year-old boys from Country B showed a sample mean of 38.7 inches with a standard deviation of 3 inches. The boys were independently sampled. Assume that heights are Normally distributed in the population. Complete parts a through c below. . Determine whether the population mean for Country B boys is significantly different from the Country A mean. Use a significance level of 0.05. Which of the following correctly states Ho and Ha? Ho. U = 39 Ho: H = 39 Ho : H #39 1-: 4 > 39 OB. Ha: H 39 Ho: H 239 Ho : H=39 3: US 39 Ha: H