Questions from Engineering Statistics

Q: Five “pours” of metals have had 5 core samples each

Five “pours” of metals have had 5 core samples each analyzed for the amount of a trace element. The data for the 5 randomly selected pours are as follows: (a) Th...

Q: A textile company weaves a certain fabric on a large number of

A textile company weaves a certain fabric on a large number of looms. The managers would like the looms to be homogeneous so that their fabric is of uniform strength. It is suspected that there may be...

Q: An analysis was conducted by the Statistics Consulting Center at Virginia Tech

An analysis was conducted by the Statistics Consulting Center at Virginia Tech in conjunction with the Department of Forestry. A certain treatment was applied to a set of tree stumps in which the chem...

Q: The mitochondrial enzyme NADPH: NAD transhydrogenase of the common rat tapeworm

The mitochondrial enzyme NADPH: NAD transhydrogenase of the common rat tapeworm (Hymenolepiasis diminuta) catalyzes hydrogen in the transfer from NADPH to NAD, producing NADH. This enzyme is known to...

Q: A study measured the sorption (either absorption or adsorption) rates

A study measured the sorption (either absorption or adsorption) rates of three different types of organic chemical solvents. These solvents are used to clean industrial fabricated-metal parts and are...

Q: It has been shown that the fertilizer magnesium ammonium phosphate, MgNH4PO4

It has been shown that the fertilizer magnesium ammonium phosphate, MgNH4PO4, is an effective supplier of the nutrients necessary for plant growth. The compounds supplied by this fertilizer are highly...

Q: For the data set in Exercise 13.7, use Bartlett’s

For the data set in Exercise 13.7, use Bartlett’s test to check whether the variances are equal. Use α = 0.05. Exercise 13.7: It has been shown that the fertilizer mag...

Q: Use Bartlett’s test at the 0.01 level of significance to

Use Bartlett’s test at the 0.01 level of significance to test for homogeneity of variances in Exercise 13.5 on page 519. Exercise 13.5:

Q: The following data represent the number of hours that two different types

The following data represent the number of hours that two different types of scientific pocket calculators operate before a recharge is required. Use the rank-sum test with α = 0.01 to...

Q: An experiment was conducted to study the effects of temperature and type

An experiment was conducted to study the effects of temperature and type of oven on the life of a particular component. Four types of ovens and 3 temperature levels were used in the experiment. Twenty...