Questions from Engineering Statistics

Q: Test the hypothesis that the average content of containers of a particular

Test the hypothesis that the average content of containers of a particular lubricant is 10 liters if the contents of a random sample of 10 containers are 10.2, 9.7, 10.1, 10.3, 10.1, 9.8, 9.9, 10.4, 1...

Q: The average height of females in the freshman class of a certain

The average height of females in the freshman class of a certain college has historically been 162.5 centimeters with a standard deviation of 6.9 centimeters. Is there reason to believe that there has...

Q: It is claimed that automobiles are driven on average more than 20

It is claimed that automobiles are driven on average more than 20,000 kilometers per year. To test this claim, 100 randomly selected automobile owners are asked to keep a record of the kilometers they...

Q: A study of the amount of rainfall and the quantity of air

A study of the amount of rainfall and the quantity of air pollution removed produced the following data: (a) Find the equation of the regression line to predict the particulate removed from the amou...

Q: According to a dietary study, high sodium intake may be related

According to a dietary study, high sodium intake may be related to ulcers, stomach cancer, and migraine headaches. The human requirement for salt is only 220 milligrams per day, which is surpassed in...

Q: A study at the University of Colorado at Boulder shows that running

A study at the University of Colorado at Boulder shows that running increases the percent resting metabolic rate (RMR) in older women. The average RMR of 30 elderly women runners was 34.0% higher than...

Q: According to Chemical Engineering, an important property of fiber is its

According to Chemical Engineering, an important property of fiber is its water absorbency. The average percent absorbency of 25 randomly selected pieces of cotton fiber was found to be 20 with a stand...

Q: Past experience indicates that the time required for high school seniors to

Past experience indicates that the time required for high school seniors to complete a standardized test is a normal random variable with a mean of 35 minutes. If a random sample of 20 high school sen...

Q: A large manufacturing firm is being charged with discrimination in its hiring

A large manufacturing firm is being charged with discrimination in its hiring practices. (a) What hypothesis is being tested if a jury commits a type I error by finding the firm guilty? (b) What hypot...

Q: A random sample of size n1 = 25, taken from a

A random sample of size n1 = 25, taken from a normal population with a standard deviation σ1 = 5.2, has a mean ¯x1 = 81. A second random sample of size n2 = 36, taken from a different normal populatio...