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Wall Street traders were anxiously awaiting the federal government's release of numbers on the January increase in nonfarm payrolls. The early consensus estimate among economists was for a growth of 250,000 new jobs (CNBC, February 3, 2006). However, a sample of 20 economists taken Thursday afternoon provided a sample mean of 266,000 with a sample standard deviation of 24,000. Financial analysts often call such a sample mean, based on late-breaking news, the whisper number. Treat the "consensus estimate" as the population mean. Conduct a hypothesis test to determine whether the whisper number justifies a conclusion of a statistically significant increase in the consensus estimate of economists. Use a = .01 as the level of significance.
Determine the average number of people you should ask in order to determine someone with same birtheday as yours.
A random sample of 100 doctors results in 83 who indicate that they recommend brand A. The value of the test statistic z in this problem is approximately?
What is the probability that a roulette ball will come to rest on an even number other than 0 and 00?
Do you think this detection bias would strengthen or attenuate the association between vegetarian diet and learning disabilities? Defend your choice briefly.
Neither subjects nor researcher knew who was assigned to what. Determine three terms explain the experimental design?
"What is the five-step process for hypothesis testing? Is the order important? Why or why not?"
Is there evidence of a difference in the variability of the waiting time between the two branches? (Use 5% level of significance). Find the p-value in (a) and interpret its meaning.
find the P-value associated with each of the given below values of the test statistic. (Give the answers to four decimal places.) (a) z = 1.20
A study is conducted to compare mean cholesterol levels for individuals following a low carbohydrate diet for at least 6 months to individuals following a conventional (low fat, low calorie )diet for at least 6 months.
What is the probability of finding a sheet chosen at random which contains 3 or more surface flaws and find the greatest standard deviation,
Professor Cox needs a volunteer amongst 30 students in his statistical applications course. The average age of his students is 25 years, with the standard deviation of 3 years.
What is the difference between evaluation and simplification of an expression? How does a term differ from a factor?
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