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Determine the p-value in each case and decide whether, at the 5% significance level, the data provide sufficient eveidence to reject the null hypothesis in favor of the alternative hypothesis.
Gas Station pump signs, at one chain, encourage customers to have their oil checked, claiming that one out of every four cars should have its oil topped.
Estimate with 95% confidence the mean reduction in time it takes for someone who has taken the sleeping pill to fall asleep.
a consultant is beginning work on three projects. the expected profits from these projects are 37. thousand 68.
A relation R is defined on the set Z of all integers. In each case, prove that R is an equivalence relation. Find the distinct equivalence classes of R and list at least four members of each.
The population mean annual salary for first year faculty at SLU is $47,000. Assuming that the population standard deviation is $1800:
Suppose an appliance manufacturer is doing a regression analysis,using quarterly time-series data, of the factors affecting its sales of appliances.
Assume that the profit from each sale is $750 for the situation in additional problem #1. What is the expected weekly profit for a salesperson?
a horse race has 12 entries and one person owns 3 of those horses. assuming that there are no ties what is the
suppose that airplane engines operate independently and fail with probability equal to 0.4. assuming that a plane makes
Ninety of these flashlights are selected at random from the production line to be tested, and 15 are found to be defective. The population is?
A running coach wanted to see whether runners ran faster after eating spaghetti the night before. A group of six runners was randomly chosen for this study.
In a recent national survey, the mean weekly allowance for a nine-year-old child from his/her parents was reported to be $3.65. A random sample of 45 nine-year-olds in northwestern Ohio revealed the mean allowance to be $3.69 with a standard devia..
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