Question 22 of 30 - Ch 16 Home
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STATE: How heavy a load (in pounds) is needed to pull apart pieces of Douglas fir 4 inches long and 1.5 inches square? Data
from students doing a laboratory exercise are given.
Weight of Load (lbs)
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
To access the data, click the link for your preferred software format.
CSV Excel (xls) Excel (xlsx) JMP Mac-Text Minitab14-18 Minitab18+ PC-Text R SPSS TI CrunchIt!
PLAN: We will estimate $\mu$ by giving a 99% confidence interval.
SOLVE: Give a 99% confidence interval for the mean load required to pull apart the wood. Suppose that the strength of pieces
of wood like these follows a Normal distribution with standard deviation 3000 pounds. Give your answers to two
decimal places.
lower bound: