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 conducts a study to investigate whether there is a difference in mean PEF in children with chroni
1. 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
Group |
Number of Children |
Mean PEF |
Std Dev PEF |
Chronic Bronchitis |
25 |
274 |
59 |
No Chronic Bronchitis |
25 |
317 |
73 |
2. Suppose a hypertension trial is mounted and 18 participants are randomly assigned to one of the comparison treatments. Each participant takes the assigned medication and his or her systolic blood pressure is recorded after 6 months on the assigned treatment. The data are as follows.
Standard Treatment |
Placebo |
New Treatment |
124 |
140 |
114 |
117 |
143 |
113 |
133 |
148 |
121 |
128 |
146 |
120 |
131 |
150 |
122 |
115 |
160 |
128 |
Is there a difference in mean systolic blood pressure among treatments? Run the appropriate test at α = 0.05.
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