Question1
In Country A, the population mean height for 3-year-old boys is 39 inches. Suppose a random sample of 153 -year-old boys from Country B showed a sample mean of 38.7 inches with a standard deviation of 4 inches. The boys were independently sampled. Assume that heights are Normally distributed in the population. Complete parts a through c below. a. 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 $\mathrm{H}_{0}$ and $\mathrm{H}_{a}$ ? A. $\begin{array}{l}H_{0}: \mu=39 \\ H_{0}: \mu \neq 39\end{array}$ $H_{0}: \mu \geq 39$ c. $H_{0}: \mu=39$ B. $H_{a}: \mu<39$ . $H_{a}: \mu<39$
$H_{0}: \mu>39$ D. $H_{a}: \mu \leq 39$ $H_{0}: \mu \neq 39$ F. $\begin{array}{l}H_{0}: \mu=39 \\ H_{a}: \mu>39\end{array}$