Say a study is interested in determining the average success rate of surgeons in the USA.  The researchers randomly select many hospitals over the country and contact surgeons in these hospitals and obtain their surgical files, but the surgical files do not contain the information need to accurately calculate each surgeons success rate.  The researchers use the files to calculate the success rate for each surgeon as best as they are able, but know the numbers are not exactly accurate.  What type of bias is this study most likely to suffer from?

A biostatistician finds the relationship between the number of weeks (X) spent in a hospital and number of seizures per week (Y) and is described by the following equation: .  This is based on a sample size of 50 patients and the associated coefficient of correlation is r = .19. Using this information above, answer the following question: How do you interpret the slope of b1 = .81?

Calculate the appropriate test statistic based on the information provided (round your answer to 4 decimal places): Research Question: Are people running more than 22.95 miles per week? Population mean = 22.95 Population standard deviation = 4 Sample mean = 23.73 Sample standard deviation = 3 Sample size = 31

Suppose you wish to compare the mean GPA of students in the College of Public Health to the mean GPA of students in the college of Medicine at USF.  If you go to each of the student lead organizations in both colleges asking for people to be apart of your study, what type of sampling are you doing?

Which of the following assumptions concerning simple regression models is stated incorrectly?

Suppose you wish to determine if students in the College of Public Health have higher GPAs than that of students in the college of Medicine at USF.  If you randomly select 50 students with GPA’s above 3.0 after they graduated and 50 students with GPA’s below 3.0 after they graduated then checked their student records to look back at what college they first enrolled in, then compare GPAs what type of study was conducted?

A biostatistician finds the relationship between the number of weeks (X) spent in a hospital and number of seizures per week (Y) and is described by the following equation: .  This is based on a sample size of 50 patients and the associated coefficient of correlation is r = .19. Using this information above, answer the following question: How do you interpret r = .19?

It is known that the population standard deviation of weight among females is 30. Assuming that we have a random sample of 210, what is the standard error of the average weight among women of a sample of this size?

A sample of 1000 subjects is stratified gender and physical activity level as follows:   Physical Activity Level Gender Low High Total Male 200 500 700 Female 100 200 300 Total 300 700 1000   In a random selection of a subject from the study population, what is the probability that the person is female?

Twelve students were randomly selected from the College of Public Health and their diastolic blood pressure was tested. The sample mean and standard deviation were 79.0 mmHg and 2.2 mmHg respectively. What is the obtained t-score for this sample under the null hypothesis Ho: µ = 80?