Recent recommendations suggest 50 minutes of physical activity per day

Recent recommendations suggest 50 minutes of physical activity per day

1. Recent recommendations suggest 50 minutes of physical activity per day.  A sample of 60 adults in a study of cardiovascular risk factors report exercising a mean of 83 minutes per day with a standard deviation of 6 minutes.  Based on the sample data, is the physical activity significantly less than recommended?  Run the appropriate test at a 5% level of significance.

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2. A clinical trial is planned to compare an experimental medication designed to lower blood pressure to a placebo.  Before starting the trial, a pilot study is conducted involving 9 participants.  The objective of the study is to assess how systolic blood pressure changes over time untreated.  Systolic blood pressures are measured at baseline and again 6 weeks later.  Is there a statistically significant difference in blood pressures over time?  Run the test at a 5% level of significance.

Baseline 121 146 131 161 153 144 127

4 Weeks 123 144 136 159 155 141 131

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