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A population consists of 45 items, 35 of which are defective. In a sample of 4 items, what is the probability that exactly 3 are defective?
For full marks your answer should be accurate to at least four decimal places.
|P(x) = 0|
The following confidence interval is obtained for a population proportion, p:(0.458, 0.490). Use these confidence interval limits to find the point estimate, p-hat.
Testing for Population mean - Can the difference in average educational level between the sample and the nation be explained by chance variation?
The normal distribution witha population standard deviation of 8 seconds. Suppose we select a sample of 16 cuts from various CD's sold by CRA CD's Inc.?
A population of size 1,000,000 claims has mean cycle time of 15 days, and a standard deviation of 4. 100 random samples of each size 64 are selected. What will be the approximate standard deviation of 100 sample means.
Linda would like to maintain a 90% service level. what safety stock level do you recommend for BX-5?
In textile industry, a manufacturer is interested in the number of blemishes or flaws occurring in each 100 feet of material. Of the following probability distributions, the one that most applies to this situation is the.
If several years pass and you want to conduct a new survey to estimate the mean length of time that car owners plan t keep their cars, how many randomly selected car owners must you survey?
An analysis decides to remove records that have missing values-About how many records would you expect would be removed
a) Test whether there is a difference between attitudes in the 2 cities. Use a 95% alpha. b) What does your result say about attitude consistency across cities?
What is the mean of the sampling distribution? What is the standard deviation of the sampling distribution? What is the probability that the mean tuition and fees of the sample is greater than $20,000?
Use 9 classes. Is the histogram approximately bell shaped and symmetic? Does this agree with the results predicted by the Central Limite Theorem?
How many participants need to be enrolled in each group to achieve 80% power using a two-sided test with significance level =.05
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