Wood Graph
For Statistics people! Sorry for the length?
How heave a load (pounds) is needed to pull apart pieces of Douglas fir 4 inches long and 1.5 inches square? Here are the data from students doing a lab exercise:
33,190 31,860 32,590 26,520 33,280
32,320 33,020 32,030 30,460 32,700
23,040 30,930 32,720 33,650 32,340
24,050 30,170 31,300 28,730 31,920
a) Make a graph to show the shape of the distribution for these data. Does the Normality condition appear safe? Suppose that the strength of pieces of wood like these follows a Normal distribution w/ standard deviation 3000 lbs.
b) Give a 90% confidence interval for the mean load required to pull the wood apart
PLEASE HELP!
Not a statistician here.
a) yes
b) (29737.5 , 31944.5)
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