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Physical Sciences
Amateur radio operators (hams) communicate with one another all over the world, and many help coordinate relief efforts during a natural disaster. Unlike the 5-watt power limit on a CB radio, ham radios can have as much as 1500 watts of power. A random sample of amateur radio operators was obtained from four states. The power on each transmitter was measured (in watts), and the summary statistics are given in the following table.
Assume the underlying transmitter power distributions are continuous. Use the Kruskal-Wallis test with a = 0.025 to determine whether there is any evidence to suggest that at least two transmitter power populations are different. Find the p value associated with this test.
it has been shown that people drive 5 - 10mph faster than the posted speed limit on a highway. it has been thought that
Suppose Abraham Lincoln had answered a survey questionnaire in which he indicated that he had not received a grade school diploma. The researcher found that Lincoln's educational score did not correlate with the expected variables. What was wrong?
Formulate the appropriate null and alternative hypotheses to test the manufacturer's belief. Using the sample mean of 99.2, compute a 90% confidence interval. Show the computation, and interpret in one sentence the interval you compute.
Doctors often use body mass index (BMI) to measure obesity. BMI is weight/height2, where weight is measured in kilograms and height in meters.
LIGHTNING DEATHS According to data obtained from the National Weather Service, 376 of the 439 people killed by lightning in the United States.
Suppose that researchers suspected that the effectiveness of the gastric freezing treatment might depend on whether a patient had recently developed the peptic.
the claim is the proportion of peas with yellow pods is equal to 0.25 or 25. the sample statistics from one experiment
A Colorado consulting firm surveys a random sample of 410 businesses in the Denver area and finds that 115 of them have women owners. Should the firm conclude that its area is unusual? Test an appropriate hypothesis and state your conclusion.
Suppose this survey was conducted using 374 men and 481 women. Do these data show enough evidence to support the conclusion that there is no difference in the proportion of men and women who think weight is a factor in purchasing a laptop? Use a 5..
The distracted group had an average score that was 10 points lower than the average for the control group. Explain why it is important that the researchers created the two experimental groups in this study by using random assignment.
State University. Public relations staff at State U. collected data on people's opinions of various colleges and universities in their state.
Suppose that the company is willing to consider dropping the distribution center limitations; that is, customers could be served by any of the distribution centers for which costs are available. Can costs be reduced? By how much - If the company d..
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