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A new process has been developed that transforms ordinary iron into a kind of super iron called metallic glass. This new product is stronger than steel alloys and is much more corrosion-resistant than steel. However, it has a tendency to become brittle at high temperatures. It is desired to estimate the mean temperature at which it becomes brittle. A random sample of 20 pieces of metallic glass is selected. The temperature at which brittleness is first detected is recorded for each piece. The summary results give a sample mean X of 600 °C and a sample standard deviation s of 15 °C. Find a 90% confidence interval for the mean temperature at which metallic glass becomes brittle.
A recent study of 50 self-service gasoline stations in the Greater Cincinnati' Northern Kentucky metropolitan area revealed that the mean price of unleaded gas was $2.029 per gallon. The sample standard deviation was $0.03 per gallon.
if the random variable z is the standard normal score and a gt 0 is it true that pz lt -a pz gt a? why or why not?
Explain how this might present a problem if we calculate a simple linear regression equation to predict GPA from number of podcasts downloaded, and explain how a scatterplot might help us identify the problem.
using the cv compare the variability of the two items. suggest reasons for any differencescv of item nr 1cv 0.01837cv
1. What are the main ethical issues, if any, in the Telemax, Inc., case? Describe each ethical issue. 2. What are Ellen's options?
a proposal has been presented to the government of newfoundland and labrador to build a new section of highway that
For the control group, the mean was 70.3 and the standard deviation was 8.3. (a) Do beta-blockers reduce the pulse rate? State the hypotheses and do a t test.
Write a series of three statements that assign the value 40 to the variable HoursWorked, the value 17.50 to the variable HourlyWage, and a statement that multiplies them together and stores the result in the variable GrossPay.
What is the probability that a random sample of 49 different one-hour shopping periods will yield a sample mean between 441 and 446 shoppers?
the heights of people of the same sex and similar ages follow a normal distribution reasonably closely. weights on the
At 95% confidence using the critical value approach, test to see if the percentage of defective systems produced by x-Game has exceeded the industry standard.
How do you solve the inequality (x + 1)(x - 6)
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