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An airline promotion to business travelers is based on the assumption that two third of business travelers use a laptop computer on overnight business trips. A sample of an American Express sponsored survey found that 355 of 546 business travelers use laptop computers on overnight business trips. State the hypotheses and test the assumption that two third of business travelers use a laptop (α = 0.05).
Chi-square test for independence of attributes - Describe why a x 2 test of the resulting contingency table is appropriate for such an investigation.
The lengths of pins produced by a machine follow a normal distribution with mean 2.54 cm and standard derivation 0.04 cm.
A study conducted by the research department of a pharmaceutical company claims that the annual spending (per person) for prescription drugs for allergy relief,is greater than or equal to the annual spending (per person) for non-prescription aller..
I have the t-score of 1.660 an a standard error of .036. I hope they are correct, but also need the test effect and test statistic, p-value.
A property of concern for any food company that uses a high-speed carton-filling machine to package juice is the weight of the food product in the individual cartons.
When determining the sample size necessary for estimating the true population mean, which factor is not considered when sampling with replacement
Explain how much should the airport authority be willing to pay for perfect information about the success of a brand new airport.
The t-statistics that was obtained in the study of 400 subjects was t=20, rejecting the null hypothesis and showing that the drug has a beneficial effect. Why was management upset?
Why use the Wilcoxon T test. What is the hypothesis statements you used? Consider do we prefer working with dependent samples or independent samples? Explain
Scores on a scholastic aptitude test are normally distributed with standard deviation σ=100 points. A group of 25 inner city high school students takes the test; their mean scores is x-bar = 440 points.
Some authorities claim that globalization has led to greater income inequality in the U.S. and globally while others claim that inequality is due to improvements in technology and productivity. Using the Library and Internet sources, do the follow..
Cables is selected and tested find the sample mean that will cut off the upper 95% of all the sample of 20 taken from the population. Assume the variable is normally distributed.
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