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Question: A mining company needs to estimate the average amount of copper ore per ton mined. A random sample of 50 tons gives a sample mean of 146.75 pounds. The population standard deviation is assumed to be 35.2 pounds. Give a 95% confidence interval for the average amount of copper in the "population" of tons mined. Also give a 90% confidence interval and a 99% confidence interval for the average amount of copper per ton.
in how many ways can a student answer an 8-question true-false examination if he marks half the questions true and half
The average buglary rate for a juisdiction has been 311 per year with a standard deviation of 50 what is the probability that next year the number of burglaries will be more than 350.
Defective calculator is 10%. If 10 calculators are selected at random, what is the probability that 4 or more of the calculators will be defective?
3 section of a statistics class containing 28,32 and 35 students averaged 83,80 and 76 respectively on same final exam. what 's the combined population means of all the 3 sections ?
Body mass index is measured as the ratio of weight in kilograms to height in meters squared. Generate a 95% confidence interval estimate of the true BMI.
How does focusing on the process rather than the end product improve output?
scores on a standardized test are normally distributed with a mean of 100 and a standard deviation of 12. an
The old equipment? based on the results, does the new equipment appears to be effective in reducing the variation of the weights?
In a random survey of 226 self-employed individuals, 20 reported having had their tax returns audited by the IRS in the past year. Estimate the proportion of self- employed individuals nationwide who've been audited by the IRS in the past year. a)..
Let X denote the waiting time until the tenth call arrives. What is the pdf of X? What are the moment generating function, mean , and variance of X?
Mean satifaction differ according to how they most use the bank? Identifing notation, state the null and alternitive hypotheses for conducting an ANOVA with data from the survey?
Develop a spreadsheet model that could be used to assist a user with retirement planning.
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