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In a study comparing individual performance with group performance, Laughlin, Zander, Knievel, and Tan found that groups consistently outperformed the best of the individuals. The task was a letters-to-numbers problem in which an arithmetic problem was presented substituting a letter in place of each digit. Participants had to determine which letters correspond to each number. Three-person groups competed with individuals and scores were compared for the groups and the best of individuals. The dependent variable was the number of trials needed to solve each problem. The following data are similar to those obtained in the study. Groups Individualsn=15 n=15M=3.8 M=4.7SS=15.4 SS=18.2
Suppose we want to conduct a poll to estimate the proportion of voters who approve of the current mayor, and we plan to use a 95% confidence interval for our estimate.
Can you give a general rule as to what happens with confidence intervals as a function of sample sizes and confidence levels? What are the trade-offs?
Clark Heter is an industrial engineer at Lyons Products. He would like to determine whether there are more units produced on the afternoon shift than on the day shift.
In what sense is this business problem? A societal problem? An individual problem?
An economics course are independent events, what is the probability that a randomly selected student is registered in either a math course or an economics course?
400 had college degrees, 100 were single, and 60 were single college graduates. The probability that an employee of the company is married and has a college degree is?
According to the National Institute for Occupational Safety and Health, job stress poses a major threat to the health of workers. A national survey of restaurant employees found that 75% said that job stress had a negative impact on their personal..
What is the probability that a particular driver had exactly two speeding violations?
A case-control study is performed to study the relationship between esophageal cancer and an exposure (exposure A).
Determine the sample size necessary to estimate a population mean to within 1 with a 90% confidence given that the population standard deviation is 10, Suppose that the sample was calculated at 150. Estimate the population mean with 90% confidence..
A marketing research analyst collects data for a random sample of 100 customers out of the 400 who purchased a particular "coupon special".
Heights Of 10-year old boys, Weve established that heights of 10-year old boys vary according to Normal distribution with =138 centimeters and = 7 centimeters. What proportion is between 150 and 140 centimeters
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