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A courier service advertises that its average delivery time is less than 6 hours for local deliveries. A random sample of times for 12 deliveries to an address across town was recorded. These data are shown here. Is this sufficient evidence to support the courier's advertisement, at the 5% level of significance? 3.03, 4.33, 6.50, 5.22, 3.56, 6.76, 3.98, 4.82, 3.96, 4.54, 5.09, 6.46
Critical Thinking: Suppose you and a friend each take different random samples of data pairs (x,y) from the sample population. Assume the samples are the same size.
What are the lower and upper specifications limits (a, b) such that only 2.5% of the pistons ring would exceed the limits. What is the power of the test if the true mean shifts by one standard deviation?
In a Gallop poll of 1012 randomly selected adults, 9% said that cloning of humans should be allowed. We are going to use a .05 significance level to test the claim that less than 10% of all adults say that cloning of humans should be allowed. The ..
National polls are often conducted by asking the opinions of a few thousand adults nationwide and using them to infer the opinions of all adults in the nation. Explain who is in the sample and who is in the population for such polls. Please use a ..
Use the above survey results to test the claim that less than half of all Ohio State female students who, if they had a cell phone, would be willing to walk somewhere after dark that they would normally not go. What is the value of the test statis..
How many samples would be required if we wished to obtain the maximum possible number of samples needed (i.e., we do not want to rely on the 37% estimate from above) with a 95% confidence and 0.03 error?
You have observed the following returns over time. Suppose that the risk free rate is 6 percent and the market risk premium is 5 percent.
Assume you are one of two manufactures of tennis balls. Both you and your competitor have zero marginal costs. Total demand for tennis balls is
Construct a 95% confidence interval estimate for the population proportion of social media users who would say it is not okay to friend their boss.
Pertaining to the matrix need simple and short answers, Find (a) the strategies of the firm (b) where will the firm end up in the matrix equilibrium (c) whether the firm face the prisoner’s dilemma.
Suppose that a pair of 14-sided dice are rolled (the sides are numbered 1-14 and yes, these do actually exist).
The following hypothetical data demonstrate the relationship. The dependent variable is a measure of language skill at age 3 for each child. Do the data indicate any significant differences? Test with α=0.05.
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