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A Psychologist has developed a new method designed to help people taking an exam. The method requires the person to come to the office of the Psychologist 5 times over a 5 week period and involves h
Find a 95% confidence interval for the true mean score by hand. What sample size would be needed so that the 95% confidence interval for the true mean score has an error of E=2.5?
Calculate the probability that the price of large popcorn falls between 3.5 and 6.5. Assuming that the Mean of prices for the sample of 50 theaters is 6. Tell us whether this result was obtained by c
From prior studies of LDL levels, best known estimate of the population varianceof this measure is 12.4. How large a sample will be needed to obtain the required estimate?
A researcher examined rates of posttraumatic stress disorder (PTSD) in mothers and fathers. Parents were interviewed 5 weeks after an accident of new diagnosis of cancer or type I diabetes for their
What, exactly, is the patient asking about the test? Identify the approptiate population paramete nedded to answer the patent's question.
A Pew Internet and American Life Project 2007 report stated that 74% of teenage boys posted their photo on their online profile, while 83% of teenage girls did so. Assume that the sample sizes were
Use these data to test for equality of variances. What is the P value of your test and what conclusion do you draw?
Plot the following set on a scatter plot. Estimate the correlation and them compute it. Next identify any outliners in the following sets of data. Explain why you consider these to be outliners. Nex
A box of candy contains 25 candy bars, of which 10 contain peanuts and 15 do not contain peanuts. if you select five bars at random, find the probability that exactly three of the bars contain peanu
According to the US Census Bureau, 7.1% of Americans living in 2004 were between the ages of 20 and 24. You take a random sample of 500 Americans and find that 28 of them are between 20 and 24 years
The probability density function f(x) = x/8 exists for the interval 3 < x < 5. What is Prob(X > 4)?
A tried-and-true revenue stream for large cities has been the funds collected from parkingn meters. In a random sample of 21 meters, the mean amount collected was $127 per meter with a standard devi
Suppose that X is a continuous random variable with probability density function: f(x) = x/18 over the interval 0 ? x ? 6. Let Y = X + 10. What is the expected value of Y?
The time it takes a cell to divide (called mitosis) is normally distributed with an average time of one hour and a standard deviation of 5 minutes.
Twenty guests arrive, ten single women and ten single men. On average, how many of the twenty adjacent pairs around the table will consist of a man and a woman?
A random survey of a small group of high school students collected information on the students' age and number of bookd they had read in the past year.
How many people should the Bureau sample in order to estimate the mean amount spent by American Latinos to within $12, if they want to be 90% confident in thier interval?
A hydraulic punch press is used to punch a slot in a 0.70-in.-thick plate. if the plate shears at a stress of 50 ksi, determine the minimum force P required to punch the slot.
The three-bolt connection shown in figure P1.8 must support an applied load of P = 55 kips. If the average shear stress in the bolts must be limited to 28 ksi.
If water is flowing through the pipe with a velocity of 3 m/s, what would be the water velocity at the restriction assuming Water density= 1000 kg/m3.
Heat is transferred to the system until the temperature is 400 oC, while the pressure remains constant. Determine the work [kJ] and the heat transfer [kJ] for this process and show the process in T-
What is the exit state of the steam (i.e., what is the exit quality)? Make whatever assumptions are necessary in order to solve this problem.
If a VSD/motor combination has a torque of 100 N.m at the rated speed and full power, what is the maximum torque it can supply at 120% rated speed?
A tourist bureau for a western state conducted a study which showed that 65% of the people who seek information about the state actually come for a visit. The office receives 15 requests for informa