When testing for differences of means, the t-statistic t equals StartFraction Upper Y overbar Subscript m Baseline minus Upper Y overbar Subscript w Over SE left parenthesis Upper Y overbar Subscript m Baseline minus Upper Y overbar Subscript w right parenthesis EndFraction

, where SE left parenthesis Upper Y overbar Subscript m Baseline minus Upper Y overbar Subscript w Baseline right parenthesis equals StartRoot StartFraction s Subscript m Superscript 2 Over n Subscript m EndFraction plus StartFraction s Subscript w Superscript 2 Over n Subscript w EndFraction EndRoot

has:

A. a student t distribution if the population distribution of Y is not normal.

B. cannot be computed unless n Subscript m equals n Subscript w.

C. a normal distribution even in small samples.

D. a student t distribution if the population distribution of Y is normal.

Goals that are overly ambitious can discourage employees and decrease motivation, yet the idea of stretch goals is proposed as a way to get people fired up and motivated. as a manager, how might you decide where to draw the line between a “good” stretch goal and a “bad” one that is unrealistic?

When paul o’neill joined alcoa as ceo, he set a , that there would be zero workplace accidents. a lot of people in the organization thought this was impossible given how dangerous some aluminum-manufacturing jobs are, but alcoa’s safety record improved tremendously. as the board of governors of the american red cross considers planning, one option is to make strategic plans and then direct managers to align tactical and operational plans accordingly. another option is to have planning specialists managers across the organization make their own plans. why might this organization’s executives opt for the latter approach? check all that apply. (a) the environment is a dynamic one, and department and frontline managers can come up with more responsive plans than can central leadership. (b)resources will be better coordinated across the organization in support of the overall strategy.(c) senior leadership will have more control over the organization’s direction. (d)when managers come up with their own plans, they are likely to be more committed to following through on them.

Gary lives in an area that receives high rainfall and thunderstorms throughout the year. which device would be useful to him to maintain his computer?