INFERENTIAL STATISTICS - please help me. thanks!

Question

D.G Co. claims that the average gross sales of their products in all their branches is 37 million/ week with a standard deviation of 6 million. A certain researcher found out that the average gross sales from the 32 branches of the same company is 34.8 million. Are the 32 branches significantly different from the rest? Use = 5% 

1. Perform the 5 steps in testing hypothesis with two-tailed or two- sided tests.
2. Perform the 5 steps in testing hypothesis with one tailed or one - sided tests.

And N= 45 branches. (all other given are the same)
Tabular or critical values of Zt

 

                                               Alpha error                               Alpha error

                                               α = 1%                                      α = 5%(0.05)

 

On-tailed or one-sided test         + 2.33                                       + 1.645

 

Two-tailed or two sided test        +2.575                                      +1.96

 

Does the question say there are a total of 45 branches in the company? YES

Is the question actually asking if the 32 surveyed branches are different from the remaining 13? YES

Answer 1

Does the question say there are a total of 45 branches in the company?

 

Is the question actually asking if the 32 surveyed branches are different from the remaining 13?