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Consider Exercise 8.39 and suppose we wish to find the sample size n needed in order to be 95 percent confident that pˆ, the sample proportion of respondents who said they took part in some sort of daily activity to keep physically fit, is within a margin of error of .02 of p, the proportion of all U.S. adults who say that they take part in such activity. In order to find an appropriate value for p(1 - p), note that the 95 percent confidence interval for p that you calculated in Exercise 8.39 was [.57, .63]. This indicates that the reasonable value for p that is closest to .5 is .57, and thus the largest reasonable value for p(1 - p) is .57(1 - .57) = .2451. Calculate the required sample size n.
Text Book: Business Statics in Practice By BOWERMAN.
a. What is the probability that the gun detects speeding and the driver was speeding? (Round your answer to 4 decimal places.)
A criminologist developed a test to measure recidivism, where low scores indicated a lower probability of repeating the undesirable behavior. The test is normed so that it has a mean of 140 and a standard deviation of 40.
Develop a second decision tree for Sonny and his team to reflect this new option of hiring the research firm prior to the possibility of developing the app
Regression analysis techniques
Polychlorinated biphenyl (PCB) is among a group of organic pollutants found in a variety of products, such as coolants, insulating materials, and lubricants in electrical equipment. Disposal of items containing less than 50 parts per million (ppm) PC..
A researcher wants to compare the testosterone levels among athletes in four sports: soccer, track, Lacrosse, and water polo. A sample is drawn in the following manner with total sample size was n =30 (10 soccer, 10 track, 5 Lacrosse, and 5 water pol..
Explain how and why you are using eight variables instead of the original number of 25. I gave the reasons and method adopted in one of the feedbacks.
Examine whether the laboratories are consistent in their measurements of the differ-ences in the amounts of niacin. Examine the validity of the assumptions made in your analysis
Use the normal distribution to approximate the following probability: According to the most recent Davenport student profile, 47% of students have children under 17 living at home with them. Find the probability that a random sample of 800 students w..
In a random sample of 28 sports cars, the average annual fuel cost was$2929 and the standard deviation was $786. Construct a 90% confidence interval for u. Interpret the results. Assume the annual fuel costs are normally distributed.
1) How much does a sleeping bag cost? Let's say you want a sleeping bag that should keep you warm in temperatures from 20°F to 45°F. A random sample of prices ($) for sleeping bags in this temperature range is given below. Assume that the population ..
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