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The average thickness of books on a library shelf is 8.3 centimeters.the standard deviation is 0.6 centimeter. If 20% of the books are oversied, find the minimum thickness of the oversized books on the library shelf. Assume the variable is normally distributed.
Assume that the mean useful life of a particular lightbulb is 2,000 hours and is normally distributed with a standard deviation of 300 hours. Determine the percentage of lightbulbs that will last 2,300 hours or longer.
To test the given claim using Single Proportion Z test.
a) What type of research uses numeric measurement data? b) What type of research uses a research hypothesis? c) What type of research does not use statistical data analysis?
In standardized form, the normal distribution a) Has a mean of 0 and a standard deviation of 1 b) Has a mean of 1 and a variance of 0 c) Has an area equal to 0.5 d) Cannot be used to approximate discrete probability distributions
A professor wants to conduct a study to know whether the grades she gives to her students affect their evaluations of her. She teaches four classes of ten students each.
At the 0.01 significance level, can we conclude that the mean number of patients per day is more than 25? Estimate the p-value and interpret it.
What are the advantages and disadvantages of regression models in comparison to using a computerized regression routine? Give examples.
Two percent of the parts from a production process are defective. A sample of five parts from the production process is selected. What is the probability that the sample contains exactly two defective parts?
A building contractor pays $500 to bid on a contract. If he gets the contract, the probability of which he estimates to be 0.70, he will make a profit of $50,000.
An experiment is designed to test the potency of a drug on 20 rats. Previous animal studies have shown that 10-mg dose of the drug is lethal 5% of the time within the first 4 hours; of the animals alive at 4 hours, 10% will die in the next 4 hours..
Write up your results by using scientifically recognized form.
The Greenberg public hearing meeting turned stormy. Citizens from four suburbs were gathered at city hall to try to get the city's federal funds for their own suburbs. The government recently awarded $750,000 to the city for road improvements. The..
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