Questions from Engineering Statistics

Q: A manufacturer claims that the average tensile strength of thread A exceeds

A manufacturer claims that the average tensile strength of thread A exceeds the average tensile strength of thread B by at least 12 kilograms. To test this claim, 50 pieces of each type of thread were...

Q: Amstat News (December 2004) lists median salaries for associate professors

Amstat News (December 2004) lists median salaries for associate professors of statistics at research institutions and at liberal arts and other institutions in the United States. Assume that a sample...

Q: A study was conducted to see if increasing the substrate concentration has

A study was conducted to see if increasing the substrate concentration has an appreciable effect on the velocity of a chemical reaction. With a substrate concentration of 1.5 moles per liter, the reac...

Q: A study was made to determine if the subject matter in a

A study was made to determine if the subject matter in a physics course is better understood when a lab constitutes part of the course. Students were randomly selected to participate in either a 3-sem...

Q: A professor in the School of Business in a university polled a

A professor in the School of Business in a university polled a dozen colleagues about the number of professional meetings they attended in the past five years (x) and the number of papers they submitt...

Q: To find out whether a new serum will arrest leukemia, 9

To find out whether a new serum will arrest leukemia, 9 mice, all with an advanced stage of the disease, are selected. Five mice receive the treatment and 4 do not. Survival times, in years, from the...

Q: Engineers at a large automobile manufacturing company are trying to decide whether

Engineers at a large automobile manufacturing company are trying to decide whether to purchase brand A or brand B tires for the company’s new models. To help them arrive at a decisio...

Q: In Exercise 9.42 on page 295, test the hypothesis

In Exercise 9.42 on page 295, test the hypothesis that the fuel economy of Volkswagen mini-trucks, on average, exceeds that of similarly equipped Toyota mini-trucks by 4 kilometers per liter. Use a 0....

Q: A UCLA researcher claims that the average life span of mice can

A UCLA researcher claims that the average life span of mice can be extended by as much as 8 months when the calories in their diet are reduced by approximately 40% from the time they are weaned. The r...

Q: The following data represent the running times of films produced by two

The following data represent the running times of films produced by two motion-picture companies: Test the hypothesis that the average running time of films produced by company 2 exceeds the average...