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Boeing has developed a new drilling tool that drills hole for riveting on the 787 wings. The standard deviation of hole diameter should be small enough to ensure that the rivet will fit. Boeing engineers took random samples of 16 from an old tool and 21 from a new tool. The two sample standard deviation of hole diameters were sold = 0.008 millimeters and snew= 0.01 millimeters. Is there strong evidence to indicate that the standard deviations of hole diameter drilled by the new drilling tool is smaller as compared to the old tool? Use alpha= 0.05.
a) Please state the appropriate null and alternative hypothesis.
b) Calculate appropriate statistics
c) Define the critical region
which of the following is an example of a correlational study?a. what are the attitudes of the parents about the
the f.s. supplies company buys calculators from a japanese supplier. the probability of a defective calculator is 20.
Can the researcher conclude that humidity has a significant effect on eating behavior? Use a two-tailed test with α=.05. Compute the estimated d and r2 to measure the size of the treatment effect.
an article in the winter 2003 issue of chance magazine reported on the houston independent school districts magnet
If 5 men and 5 women are to be chosen randomly and then paired off, what is the probability of a given pair (Alice-Bob) to be formed?
A group of employees at a large factory was asked to indicate their preference for one of two pension schemes. The table below gives the responses of three different categories of employees at the factory.
Describe the types of decisions that do not involve uncertainty and risk and common approaches used for analyzying them.
In a classical experiment, Gregor Mendel observed the shape and color of peas that resulted certain crossbreedings. A sample of 556 peas was studied with the result that 315 produced round yellow,
The ages of 25 employees in a company are listed below in a stem and leaf plot. What is the probability that a worker chosen at random will have an age greater than or equal to 30 and less than or equal to 39?
Explain which indicate that changes in the concentration of carbon dioxide which cause changes in the global temperature
"Factorial" means that the treatments are formed from more than one factor. What are the factors? What do "double-blind" and "placebo-controlled" mean?
The following table lists the annual amounts of glass cullet produced by Kimble Glass Works, Inc. Determine the least squares trend equation. Estimate the amount of scrap for the year 2005.
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