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1. Construction company A+A is responsible for a stretch of road 3 miles long. The distance at which any defects occurs can be represented by a uniformly distributed random variables, with probability density function, f(x)=0.3. Find the cumulative distribution function and the probability that...
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Survey Paper
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A company produces packets of soap powder that are labeled Giant Size 32 Ounces. The actual weight of soap powder in a box has a normal distribution, with a mean of 33 oz. and a standard deviation of 0.7 oz. 95% of packets actually contain more than x oz. of soap powder. What is x?
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body tempature normally distributed with a mean of 98.20 and a standard deviation of 0.62
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Downs and Abwender found neurological deficits in soccer players who are routinely hit on the head with soccer balls compared to swimmers, who are also athletes but who are not regularly hit in the head. Is this an example of an experimental or nonexperimental study?
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Imagine that you can predict the class's scores on the Tests for Understanding in this course. In Week 1, there was a bimodal distribution. In Week 2, there was a positive skew. In Week 3, there was a normal distribution. In Week 4, there was a negative skew. What do these different...
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Find the probability that at most 5 defective bolts will be found in a box of 200 bolts if it is known that 2 per cent of such bolts are expected to be defective .(you may take the distribution to be Poisson; e-4= 0.0183).
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An educational psychologist wanted to know the effects of 4 different methods of teaching arithmetic. He selected 3 classrooms of third graders to receive each of the four teaching methods (12 classrooms in all). At the end of the school year, all the pupils took the same achievement test, and...
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A field researcher is gathering data on the trunk diameters of mature pine and spruce trees in a certain area. The following are the results of his random sampling. Can he conclude, at the .10 level of significance, that the average trunk diameter of a pine tree is greater than the average...
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- 1. A school administrator wonders if students whose first language is not English score differently on the math portion of the sat exam than students whose first language is English. The mean SAT math score of students whose first language is english is 516 on the basis of data obtained from the college board. A simple random sample of 20 students whose first language is not English result in a sample mean SAT math score of 522. SAT math score are normally distributed with a population standard deviation of 114. Why is it necessary for SAT math scores to be normally distributed to test the hypothesis?
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