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You are interested in determining if a low-sodium diet ( <100 mmol/day) lowers systolic blood pressure in patients with chronic kidney disease (CKD).Forty patients with
You are interested in determining if a low-sodium diet (<100 mmol/day) lowers systolic blood pressure in patients with chronic kidney disease (CKD).Forty patients with stage IV CKD with elevated blood pressure were enrolled. Twenty two (22) were provided with a normal sodium diet for 4-weeks and 22 were given a low-sodium diet for 4-weeks. Blood pressure was measured after 4-weeks on the diets.The data are shown below:
Research Question: Does a low-sodium diet decrease systolic blood pressure in patients with stage IV CKD.
- If these data were analyzed by a parametric test, what are the assumptions associated with this analysis?
- 2. State the null and alternative hypotheses for this experiment?
- Would a one-tailed or two-tailed test be used for this experiment? Explain your answer.?
- What are the degree's of freedom for this experimental design if you analyzed these data by a parametric test?
- Name a parametric and a nonparametric statistical test that could be used to analyze the data from this experiment?
Normal Sodium Diet Systolic BP (mm Hg) | Low Sodium Diet Systolic BP (mm Hg) | |
157 | 191 | |
171 | 136 | |
164 | 140 | |
168 | 150 | |
151 | 141 | |
178 | 154 | |
126 | 163 | |
179 | 164 | |
156 | 168 | |
176 | 130 | |
183 | 157 | |
149 | 150 | |
143 | 122 | |
155 | 142 | |
165 | 120 | |
185 | 128 | |
167 | 139 | |
158 | 141 | |
145 | 131 | |
177 | 150 | |
145 | 163 | |
140 | 145 | |
n | 22 | 22 |
Mean | 160.82 | 145.59 |
SD | 15.73 | 16.83 |
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