Solve problem #1 by hand using the 7-step method. Toreceive full credit, show all hand calculations.
1. Rats who grow up in an uncrowded environment (1 ratper cage) live a mean number of 38 months.
A psychologist wants to know the effect of crowding on lifeexpectancy of rats. A group of 31 rats
are raised in crowded conditions (3 rats per cage) and their age atthe time of their natural death is recorded.
The data are: 43 39 38 37 36 39 35 36 40 40 41 36 3839 41 39
           41 40 37 35 38 38 39 37 43 39 37 38 40 39 32
a) Use the 7 step method at ï¡ï€ = .05 to test thepsychologist's prediction.
