A random sample of 8 steel beams has an average compressive strength of 56,598 psi with a standard deviation of 564 psi. Since the value of studentized average compressive strength of 56,598 psi is strength of the steel beams from which this sample was taken is 56,000 psi is level of significance of _and _t(0.025,7) the hypothesis that the true average at a
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- A standard method for the determination of residual chlorine in sewage effluents is known from 10 sets of measurements to have a mean of 57.6 ppm and a standard deviation of 0.32 ppm Cl. Slight modification of the method yields an average value of 49.3 ppm standard deviation of 0.25 ppm for a pooled data set with 9 degrees of freedom. Is there a significant difference in the precisions of the two methods? Is there a significant difference in the means of the two methods?A random sample of 10 size AA batteries for toys yield a mean of 2.87 hours with standard deviation, 0.69 hours. Find the critical value, t*, for a 99% CI and the margin of error for a 99% CI. Give both to 3 decimal places.The owner of a coin-operated hot coffee machine has received claims that there is an error in his machine, and it is not dispensing enough hot coffee into hand-held cups. He takes a random sample of 46 “8 oz servings” from a large number of servings and finds that the mean is 7.93 fluid ounces with a standard deviation of 0.38 ounces. Is this evidence of error in the machine if ? = 0.05? Use the P-Value method.