Peak expiratory flow (PEF) is a measure of a patient’s
10. Consider again the study described in the problem below, taken from the Chapter 6 quiz.Peak expiratory flow (PEF) is a measure of a patient’s ability to expel air from the lungs. Patients with asthma or other respiratory conditions often have restricted PEF. The mean PEF for children free of asthma is 306. An investigator wants to test whether children with chronic bronchitis have restricted PEF. A sample of 40 children with chronic bronchitis is studied and their mean PEF is 279 with a standard deviation of 71. Is there statistical evidence of a lower mean PEF in children with chronic bronchitis? Run the appropriate test at .05.A different investigator conducts a second study to investigate whether there is a difference in mean PEF in children with chronic bronchitis as compared to those without. Data on PEF are collected and summarized below. Based on the data, is there statistical evidence of a lower mean PEF in children with chronic bronchitis as compared to those without? Run the appropriate test at .05.GroupNumber of ChildrenMean PEFStd Dev PEFChronic Bronchitis2528168No Chronic Bronchitis253197411. For each question below, provide a brief (1-2 sentences) response.How is the slope coefficient (b1) in a simple linear regression different than the coefficient (b1) in a multiple linear regression model?When would a survival analysis model be used instead of a logistic regression model?What is the appropriate statistical test to assess whether there is an association between obesity status (normal weight, overweight, obese) and 5-year incident cardiovascular disease (CVD)? Suppose each participant’s obesity status (category) is known as is whether they develop CVD over the next 5 years or not.
