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exercise 14.50 gives data on the pounds of load needed to pull apart pieces of douglas fir. the data are a random sample from a normal distribution...

exercise 14.50 gives data on the pounds of load needed to pull apart pieces of douglas fir. the data are a random sample from a normal distribution with a standard deviation of 3000 pounds.

a. is there significant evidence at the alpha=.10 level against the hypothesis that the mean is 32,000 pounds for the two-sided alternative?
b. is there significant evidence at the aplpha=.10 level against the hypothesis that the mean is 31,500 pounds for the two sided alternative?

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