(Solved): (a) Use a calculator with sample mean and sample standard deviation keys to calculate x1,s1 ...

(a) Use a calculator with sample mean and sample standard deviation keys to calculate ${\stackrel{?}{x}}_1,s_1,{\stackrel{?}{x}}_2$, and $s_2$. (Round your answers to four decimal places.) $\begin{array}{ll}{\stackrel{?}{x}}_1=& ?\\ s_1=& ?\\ {\stackrel{?}{x}}_2=& ?\\ s_2=& ?\end{array}$ attitudes? Use $?=0.05$. Assume that the two lost-time population distributions are mound-shaped and symmetric. (i) What is the level of significance? $2$ State the null and alternate hypotheses. (Enter $!=$ for $?=$ as needed.) $\begin{array}{l}{H}_0:\\ H_1:\end{array}$ Use the sample test statistic to find the corresponding $z$ or $t$ value as appropriate. (Test the difference ${?}_1?{?}_2$. Round your final answer to two decimal places.) $\mathrm{x}$