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A coin is biased such that a head is three times as likely to occur as a tail. Find the expected number of tails when the coin is tossed twice
A 1982 study indicated that 40% of young adults (18-25 years old) in the U.S. smoked cigarettes. In a later survey of 1500 young adults, 536 were found to be smokers. Do the data indicate that the smoking rate for young adults in the U.S. has decreas..
An airline wants to estimate the average number of unoccupied seats per flight. A random sample of 30 flights is selected and the mean number of unoccupied seats is 7.6. Assume that the population standard deviation of unoccupied seats is known to be..
Recorded the time in seconds it took for 8 participants to solve a puzzle. These times appear below. However, when the data was entered into the statistical program, the score that was supposed to be 22.1 was entered as 21.2.
A random sample of 89 observations produced a mean x (x bar) = 25.8 and a standard deviation s= 2.4. - find a 95, 90, and 99% confidence interval for u. In a sample of 304,000 items mailed between Dec. 10 and Mar. 3, the accounting firm determined th..
The average weekly earnings of the plumbers in a city is [Mu=$750] with a standard deviation of [s=$40]. Assume that we select a random sample of [n=64 plumbers], what is the probability that the sample mean [x] will be greater than $740 or greater ..
What is the critical path and project completion time for the budgeting process and what is the cost to complete the project based on the Normal Times?
Tutor O-rama claims that their services will raise student SAT math scores at least 50 points. The average score on the math portion of the SAT is μ = 350 and σ = 35. The 100 students who completed the tutoring program had an average score of 385 poi..
Calculate a 95% confidence interval for the unknown population mean business age - Test, at the 5% level of significance, whether location (Parramatta or Sydney CBD) of the business is related to type of business (privately held, publicly traded or..
Suppose the distribution of the cost of all trips is normal with an average of 112 dollars and a standard deviation of 11 dollars. What is the value of the cost that falls of the 7th percentile?
The maximum likelihood estimate for the odds ratio
Calculate the correlation coefficient
In conjunction with the housing foreclosure crisis of 2009, many economists expressed increasing concern about the level of credit card debt and efforts of banks to raise interest rates on these cards. The banks claimed the increases were justified. ..
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