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Question: In a study investigating freshman weight gain, the researchers also looked at gender differences in weight (Kasparek, Corwin, Valois, Sargent, & Morris, 2008). Using self-reported heights and weights, they computed the Body Mass Index (BMI) for each student. Based on the BMI scores, the students were classified as either desirable weight or overweight. When the students were further classified by gender, the researchers found results similar to the frequencies in the following table. Desirable Weight Overweight Males 74 46 Females 62 18 a. Do the data indicate that the proportion of overweight men is significantly different from the proportion of overweight women? Test with α = .05.
b. Compute the phi-coefficient to measure the strength of the relationship.
A school tracks the absences of pupils as part of a flu surveillance system. Regular reporting of absences among 25 students in grade 1 are taken, and based on these data, the long-run proportion of absences under normal conditions is estimated to..
Use a decision tree to recommend a decision. What is the expected value of the market research information? What is the efficiency of the information?
A nurse at a local hospital is estimating the weight of infants. how large a sample must she select if she desires to be 95% confident that the true mean is within 3 ounces of the sample mean?
computing the mean median range and standard deviation for the given data.weekly salaries in dollars for a sample of
If we want to estimate the populations mean travel-to-work time San Francisco residents with a margin of error of 1 minute, what sample size should be used? Assume 95 percent confidence.
Why are the data that Jack has gathered qualitative in nature and describe the steps in qualitative data analysis (data reduction, data display, and the drawing of conclusions) on the basis of Jack's study
A decade-old study found that the proportion, p, of high school seniors who believed that "getting rich" was an important personal goal was 75%. A researcher decides to test whether or not that percentage still stands.
What is the probability that no requests for assistance are in the system? What is the average number of requests that will be waiting for service? What is the average waiting time in minutes before service begins?
An official of the Iowa department of Highways wants to compare the useful life, in months, of two brands of paint used for striping roads. The mean number of months Cooper Paint lasted was 36.2
Study have in distinguishing between case-fatality rates in 1990 and 2000-2005 if a two-sided test with significance level .05 is planned? B. How large a sample is needed in the previous problem to achieve 90% power?
A math course has 2 sections. Section one has 55 students of which 10 received an A. Section two has 45 students of which 11 received an A. If a student was chosen randomly from 100 students
What is the minimum GPA that qualifies a student to graduate with honors and It has been decided by the Faculty Senate that all students with GPAs in the top 16% will graduate with honors
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