Answer Happy

Is injecting medical cement effective in reducing pain for people who have suffered fractured vertebrae? A paper describes an experiment to compare patients who underwent vertebroplasty (the injection of cement) to patients in a placebo group who underwent a fake procedure in which no cement was actually injected. Because the placebo procedure was similar to the vertebroplasty procedure except for the actual injection of cement, patients participating in the experiment were not aware of which treatment they received. All patients were asked to rate their pain at three different times-3 days, 14 days, and 1 month after the procedure. Summary statistics are given in the accompanying table. n = 73 Pain Intensity Vertebroplasty Group Placebo Group n = 63 mean sd mean sd 4.2 2.8 3.9 2.9 4.3 2.9 4.5 2.8 3.9 2.9 4.6 3.0 3 days 14 days 1 month

Mplacebo. Round your answers to two decimal places.) (c) Construct and interpret 95% confidence intervals for the difference in mean pain intensity at 14 days after treatment. (Use Avertebroplasty -1.384 X to 0.584 X Internet the internal

Construct and interpret 95% confidence intervals for the difference in mean pain intensity at 1 month after treatment. (Use vertebroplasty - Mplacebo. Round your answers to two decimal places.) -1.384 X to 0.584 x Interpret the interval. There is a 95% chance that the true difference in mean pain intensity 1 month after treatment for the vertebroplasty treatment and the fake treatment is directly in the middle of these two values. We are 95% confident that the true mean pain intensity 1 month after treatment for the fake treatment is between these two values. There is a 95% chance that the true mean pain intensity 1 month after treatment for the vertebroplasty treatment is directly in the middle of these two values. We are 95% confident that the true difference in mean pain intensity 1 month after treatment for the vertebroplasty treatment and the fake treatment is between these two values. We are 95% confident that the true mean pain intensity 1 month after treatment for the vertebroplasty treatment is between these two values. x