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1. What important assumption about the relation between blocks and treat- ments is necessary for carrying out a block design ANOVA?
2. Public concern has recently focused on the fact that although people in the United States often try to lose weight, statistics show that the general population has gained weight, on average, during the last 10 years. A researcher hired by a weight- loss organization is interested in determining whether three kinds of arti?cial sweet- ener currently on the market are approximately equally effective in reducing weight. As part of a study, a random sample of 300 people is chosen. Each person is given one of the three sweeteners to use for a week, and the number of pounds lost is recorded. To reduce experimental errors, the people in the sample are divided into 100 groups of three persons each. The three people in every group all weigh about the same at the beginning of the test week and are of the same sex and approximate- ly the same age. The results are SSBL = 2,312, SSTR = 3,233, and SSE = 12,386. Are all three sweeteners equally effective in reducing weight? How con?dent are you of your conclusion? Discuss the merits of blocking in this case as compared with the completely randomized design.
A fast-food restaurant sells hamburgers and chicken sandwiches. On a typical weekday, the demand for hamburgers is normally distributed with a mean 313 and a standard deviation 57; the demand for chicken sandwiches is normally distributed with a m..
1. The manager of Erehwon police department motor pool wants to develop a forecast model for annual maintenance costs on police cars, based on mileage in the past year, and age of cars. The following data have been collected for eight different car..
Do these results suggest that the racial makeup of the faculty members is different from that of the students? (Use the .05 significance level.) Use the five steps of hypothesis testing and explain your findings.
An occupational health study was carried out to evaluate the health status of workers. The response is forced expiratory volume (FEV), a measure of respiratory function.
an object is in simple harmonic motion. find an equation for the motion given that the frequency is 4pi and at time t
X has a normal distribution with a mean of 80.0 and a standard deviation of 3.5. Find the following probabilities:
The five-year disease-free survival rate for women receiving CEF alone as adjuvant therapy was estimated at about 60%, and it is hypothesized that the newly formed regimen would improve that rate from 60% to 70%. Find the total sample size needed ..
Compute the mean profit, the minimum profit, and the maximum profit and what is your estimate of the probability of a loss?
Suppose it is desired to estimate the population mean number of miles with a margin of error of ± 2 miles at 95% confidence. Do the data provide this desired level of precision? What action, if any, would you recommend be taken?
Describe the use of sensitivity analysis and postoptimality analysis in analyzing the results. Describe the characteristics of a Bernoulli process. How is a Bernoulli process associated with the binomial distribution?
the fracture strength of tempered glass averages 14 measured in thousands of pounds per square inch and has standard
the probability of a manufacturing defect in an aluminum beverage can is .00009. if 100700 cans are produced find the
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