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A stationery store wants to estimate the mean retail value of greeting cards that it has in its inventory. A random sample of 100 greeting cards indicates a mean value of $2.55 and a standard deviation of $0.44.
Assuming a normal distribution construct a 95% confidence interval estimate for the mean value of all greeting cards in the store's inventory.
Suppose there are 2,500 greeting cards in the store's inventory. How are the results in (a) useful in assisting the store owner to estimate the total value of the inventory?
Describe how the three interval estimates will be related to each other. Which of the three intervals is most likely to contain the population mean?
Evolutionary theories often emphases that humans have adapted to their physical environment. One such theory hypothesizes that people should spontaneously follow a 24-hour cycle of sleeping and waking - even if they are not exposed to the usual pa..
(a) Find the median cost of houses at Coal City in 1988. (b) Find the modal selling price of houses at Coal City in 1988.
Distributed with a mean of 9.5 years and a standard deviation of 1.8 years. Find the replacement time that separates the top 18% from the bottom 82%.
if two voters are randomly selected for a telephone survey, what is the probability that they one is a Democrat followed by a Republican? Round your answer to 4 decimal places.
College is 0.74. A random sample of 280 high school seniors is surveyed. Describe the distribution of the number of students in the sample of 289 that will not attend college.
Also it is known that the probabilities are 0.15, 0.2, and 0.25 that the parts will be defective if they are produced in the ?rst, second, or third plants, respectively. What is the probability that a randomly picked part from this batch is not de..
If there is relationship between parental income and SAT score, why can't we bring to a close that differences in score are caused by differences in parental income.
What is the probability that an employee will have a cold next year? Given that an employee is involved in an exercise program, what is the probability that he or she will ge a cold next year?
Assume that the number of customers who arrive at a water ice stand follows the Poisson distribution with an average rate of 6.4 per 30 minutes. What is the probability that three or four customers will arrive during the next 30 minutes?
In a statistics lecture, students are asked whether or not they enjoyed doing statistics. Random sample of 50 students was taken and 30 of them said that they enjoyed doing statistics.
Effect of a new training program on time taken to complete a task, measured by a "before" and "after" test
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