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1. A producer specifies that the mean lifetime of a certain type of battery is at least 240 hours. A sample of 18 such batteries yielded the following data.
237 242 232
242 248 230
244 243 254
262 234 220
225 236 232
218 228 240
Assuming that the life of the batteries is approximately normally distributed, do the data indicate that the specifications are not being met?
2. A company supplies plastic sheets for industrial use. A new type of plastic has been produced and the company would like to claim that the average stress resistance of this new product is at least 30.0, where stress resistance is measured in pounds per square inch (psi) necessary to crack the sheet. The following random sample was drawn off the production line. Based on this sample, would the claim clearly be unjustified?
30.1 32.7 22.5 27.527.7 29.8 28.9 31.431.2 24.3 26.4 22.829.1 33.4 32.5 21.7
Assume normality and use the 5 percent level of significance.
What is/are the advantage(s) of conducting a study with three or more levels of independent variables?
Susan Williams has been the production manager of Medical Suppliers, Inc., for the past 17 years. Medical Suppliers, Inc., is a producer of bandages and arm slings.
there is a 25 chance that a fuse of a certain type is defective. approximate the probability of having more than or
Show the odds of any two individuals having the same birthday are slightly greater than 1:1 (1:.9732 actually).
Suppose that the probabilities are 0.60, 0.20, 0.10, and 0.10 that a state income tax return will be filled out correctly, that it will contain only errors favoring the taxpayer, that it will contain only errors favoring the state, or that it will..
There are two car dealerships in a particular region. The mean monthly sales at the two dealerships are about the same. Though, one of the dealerships (dealership A) is boasting to corporate headquarters that his dealership's monthly sales are mor..
What is the probability of a fatal accident over a lifetime? Explain your reasoning carefully. Hint: Assume independent events. Why might the assumption of independence be violated?
an insurance company offers a policy for a 100000 in the case of death during a calendar year for its young customers.
While dealing with 16 students, suppose that the alternative hypothesis has been one-sided and that it was set as Ha :
Construct the payoff table for this decision situation. Compute the expected value of each alternative amount of milk that could be stocked, and select the best decision.
Perform a significance test to see if there is a relation between mortality and duration of employment in the group hired AFTER 1945 and report a p-value.
consider the experiments first draw a poisson random variable n with parameterlambda. then perform n independent
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