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WLD Incorporated, a national data-collection agency, estimates that 55% of all customers at home warehouse stores (in the United States) own their own home. WLD also estimates that 30% of all home warehouse customers have lived at their current address for less than five years, and that 58% of all home warehouse customers own their own home or have lived at their current address for less than five years (or both). Using these estimates, what is the probability that a randomly selected home warehouse customer both owns her own home and has lived at her current address for less than five years?
To test whether there is significant mean difference between two groups using independent sample t test.
A noted psychic was tested for ESP. The psychic was presented with 400 cards face down and asked to determine if each card was marked with one of four symbols: a star, cross, circle, or square. The psychic was correct in 120 cases. Let p represent..
Determine the probability of fatal accident over a lifetime? Describe your reasoning carefully. Hint: Suppose independent events. Why might the supposition of independence be violated?
Suppose a statistician chose to test a hypothesis at sigma = 0.01. The critical value for a right-tailed test is +2.33. If the test value were 1.97, what would the decision be?
What sample size and acceptable level would result in a probability of .05 that a good batch will be rejected and a probability of .10 that a bad batch will be accepted?
How can we be certain that surveys and statistics that we hear about in the media are accurate samples and unbiased? Is there a way to dissect the information and determine if a probability sample was used?
What is the difference between common cause variation and special cause variation?
Let μ be the hourly wage (excluding tips) for workers who provide hotel room service in a large city. A random sample of a number (more than 30) of such workers yielded a 95% confidence interval for μ of $8.46 to $9.86 using the normal distributio..
What are the hypotheses we would want to test for the Kleenex case?
According to the empirical rule, if the data from a "bell-shaped" normal distribution ______ percent of the observation will be contained between 2 standard deviations below the mean and 2 standard deviations above the mean.
By using the 0.10 level of significance, is there evidence that the population mean is above the $300?
A manuscript is sent to a typing firm consisting of typists A, B, and C. If it is typed by A, then the number of errors made is a Poisson random variable with mean 2.6; if typed by B, then the number of errors is a Poisson random variable
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