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Find an article in a professional journal that includes a confidence interval of the type discussed. Write a brief report describing the confidence interval and its role in the context of the article. Compare and contrast your responses.
Statistics and Probability, Statistics
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A researcher randomly assigned 160 subjects into one of two groups: Atkins diet or Weight Watchers. The response variable was weight change in pounds after 6 weeks. The t-test results showed a p-value=.049. What can be c ...
A manufacture claims that the life span of its tires is 52,000 miles. You work for a consumer protection agency and you are testing these tires. Assume the life spans of these tires are normally distributed. You select 1 ...
Suppose we can only sample from Uniform distribution (0,1) with k=3. Design an algorithm to simulate chi-square distribution with 2k freedom via general transformation method.
Researchers randomly assigned 25 beginning students of Russian to begin speaking practice immediately and another 25 to delay speaking for 4 weeks. At the end of the semester both groups took a standard test of comprehen ...
The service manager for a car dealership reviewed sales records of the past 25 sales of new cars to determine the number of warranty repairs he will be called on to perform in the next 90 days. Corporate reports indicate ...
A political candidate wishes to determine if endorsing increased social spending is likely to affect her standing in the polls. She has access to data on the popularity of several other candidates who have endorsed incre ...
A study shows that 81% of the population of all calculus students consider calculus an exciting subject. Suppose 34 students are independently selected from the population. If the true percentage is really 81%, find the ...
"A population has a mean of 150 and a standard deviation of 21. If a random sample of 49 is taken, what is the probability that the sample mean is between 152.5 and 157.5 using z scores?"
A researcher selects from a participant pool of 8 males and 11 females. He determines that the probability of selecting 2 female participants is p = .335. Based on this probability, what strategy did the researcher use t ...
You know that the price of Sunland, Inc., stock will be $36 exactly one year from today. Today the price of the stock is $34. Determine what must happen to the price of Sunland, Inc., today in order for an investor to ge ...
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