# Question 3 an investigator conducts a study to

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Question 3 An investigator conducts a study to investigate whether there is a difference in means 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? Apply the two sample t test at alpha = 0.05. Group Number of children Mean PEF Std Dev PEF Chronic Bronchitis 25 281 68 No chronic bronchitis 25 319 74
2. Upper limit 95% CI = 349.55
3. Lower limit CI 95% = 288.45
4. Based on comparing the critical the upper and lower limits of the confidence interval for the mean of PEF for children with no Chronic Bronchitis to the mean PEF for children with
Question 4 The following are body mass index (BMI) scores measured in 12 patients who are free of diabetes and particularly in a study of risk factors for obesity. Body mass index is measured as the ratio of weight in kilograms to height in meters squared. Generate a 95% confidence interval estimate of the true BMI. 25, 27, 31, 33, 26, 28, 38, 41, 24, 32, 35, 40
8. Which of the following is true?
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