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A manufacturer claims that the calling range (in feet) of its BOO-MHZ cordless telephone is greater than that of its leading competitor. A sample of 9 phones from the manufacturer had a mean range of 1350 feet with a standard deviation of 42 feet. A sample of 17 similar phones from its competitor had a mean range of 1280 feet with a standard deviation of 28 feet. Do the results support the manufacturer's claim? Letp1 be the true mean range of the manufacturer's cordless telephone and p2 be the true mean range of the competitor's cordless telephone. Use a signi?cance level of a = 0.1 for the test. Assume that the population variances are equal and that the two populations are normally distributed.
airlines sometimes overbook ights. suppose that for a plane with 50 seats 55 passengers have tickets. dene the random
Carry out a survey to estimate the mean or total of a population of your choice, in which an auxiliary variable is available along with the variable of interest.
A) Suppose a new poll will also interview another 1213 randomly selected likely voters. What are the mean and standard deviation of the approval rate of clinton based on this new poll?
At the .01 significance level, can the manufacturer conclude that the price reduction resulted in an increase in sales?
State the decision for this test. Explain the reason for this decision using a comparison of the critical value to the computed test statistic,a comparison of the p-value to the 5% significance level, and the graph displayed above.
a satellite system consists of 4 components and can function adequately if at least 2 of the 4 components are in
a. For a classification table using the sample proportion of 0.642 as the cutoff, report the sensitivity and specificity. Interpret.b. Form a ROC curve, and report and interpret the area under it.
Art therapy is a common tool to use with children who have a hard time bonding with a therapist and opening up during therapy sessions. Dr. Contos wants to examine if children who participate in art therapy (M.48, SD.67) score lower on levels of ..
Interpret the slope and intercept of the regression model.- What does the value of say about how successful the model is?- Interpret in this context.
A random sample of 35m of the firm's accountants has a mean workday of 8.2 hours with a standard deviation of 0.5 hour. At α = 0.01, can you support the CEO's claim?
He randomly selects a sample of 10 items of the procduct from a large lot ready to be shipped. He (given that) the true proportion of perfect condition items is only 80% what is the probability that the lot will not be shipped?
?(a) What is the probability of randomly selecting 1 woman with a height less than 66? inches?
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