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HLTH 501 Biostats Final Exam Review
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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 1. z 95% confidence interval = 1.96 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 bronchitis which of the following is (are) true? (a) There is statistical evidence of a lower mean PEF in children with chronic bronchitis as compared to those without (b) There is NOT statistical evidence of a lower mean PEF in children with chronic bronchitis as compared to those without (c) The confidence interval contains the mean PEF for the No chronic bronchitis group (d) a and c [Show More]
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