7. Medical researchers conducted a study to determine whether treadmill exercise could improve the walking ability...
7. Medical researchers conducted a study to determine whether treadmill exercise could improve the walking ability of patients suffering from claudication, which is pain caused by insufficient
blood flow to the muscles of the legs. A sample of 8 patients walked on a treadmill for six minutes every day. After six months, the mean distance walked in six minutes was 395 meters,
with a sample standard deviation of 80 meters. For a control group of 7 patients who did not walk on a treadmill, the mean distance was 305 meters with a standard deviation of 93 meters.
(a) Determine, at the 90% confidence level, the difference between the treadmill walkers and the non-treadmill walkers. Interpret the results in the context of the problem.
(b) At the 5% significance level, does the data provide sufficient evidence to conclude that the average distance of walking on a treadmill differs from the average distance of the non-treadmill
walkers? Interpret the results in the context of the problem.
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7. Medical researchers conducted a study to determine whether
treadmill exercise could improve the walking ability...
Exercise: Medical researchers conducted a study to determine whether treadmill exercise could improve the walking ability...
Exercise: Medical researchers conducted a study to determine whether treadmill exercise could improve the walking ability of patients suffering from claudication, which is pain caused by insufficient blood flow to the muscles of the legs. A sample of 47 patients walked on a treadmill for six minutes every day. After six months, the mean distance walked in six minutes was 341 meters, with a standard deviation of 79 meters. For a control group of 39 patients who did not walk...
7. A pharmaceutical believes a newly developed pain reliever will more quickly e d pain to...
7. A pharmaceutical believes a newly developed pain reliever will more quickly e d pain to patients after minor surgeries than a standard pain reliever. The standard wy developed pain reliever will more quickly produc andard aan elveris known to bring average of 3.6 minutes with a standard deviation of 2 minutes to test whethe faster than the standard pain reliever 50 patients with minor surseries were given the new data vielded as da yielded a sample mean of 33minutes...
A clinical trial was conducted to test whether a drug for treating insomnia is effective. Researchers...
A clinical trial was conducted to test whether a drug for treating insomnia is effective. Researchers administered the drug and measured the time it took 23 randomly selected subjects to fall asleep. The subjects had a mean wake time of 96.6 min and a sample standard deviation of 24.5 min. Assume that the population of wake times is normally distributed. (a) Construct a 95% confidence interval. You may use your calculator. Round to 1 decimals. (b) Are the assumptions met?...
Two researchers conducted a study in which two groups of students were asked to answer 42...
Two researchers conducted a study in which two groups of students were asked to answer 42 trivia questions from a board game. The students in group 1 were asked to spend 5 minutes thinking about what it would mean to be a professor, while the students in group 2 were asked to think about soccer hooligans. These pretest thoughts are a form of priming. The 200 students in group 1 had a mean score of 26.2 with a standard deviation...
Two researchers conducted a study in which two groups of students were asked to answer 42...
Two researchers conducted a study in which two groups of students were asked to answer 42 trivia questions from a board game. The students in group 1 were asked to spend 5 minutes thinking about what it would mean to be a professor, while the students in group 2 were asked to think about soccer hooligans. These pretest thoughts are a form of priming. The 200 students in group 1 had a mean score of 25.5 with a standard deviation...
3. You will need to download the data file "Wet Suits" from Sakai. Researchers are interested...
3. You will need to download the data file "Wet Suits" from Sakai. Researchers are interested in finding out if wet suits allow a swimmer to swim faster. Researchers measured the speed (in meters per second) of swimmers both with and without a wet suit. The results of the study are shown in the table. A normal probability plot indicates the differences d = with - without are approximately normally distributed. Swimmer With 1.57 1.47 1.42 1.35 1.22 1.75 1.64...
photos for each question are all in a row (1 point) In the following questions, use...
photos for each question are all in a row
(1 point) In the following questions, use the normal distribution to find a confidence interval for a difference in proportions pu - P2 given the relevant sample results. Give the best point estimate for p. - P2, the margin of error, and the confidence interval. Assume the results come from random samples. Give your answers to 4 decimal places. 300. Use 1. A 80% interval for pı - P2 given that...
7. A pharmaceutical believes a newly developed pain reliever will more quickly e d pain to patients after minor surgeries than a standard pain reliever. The standard wy developed pain reliever will more quickly produc andard aan elveris known to bring average of 3.6 minutes with a standard deviation of 2 minutes to test whethe faster than the standard pain reliever 50 patients with minor surseries were given the new data vielded as da yielded a sample mean of 33minutes...
Two researchers conducted a study in which two groups of students were asked to answer 42 trivia questions from a board game. The students in group 1 were asked to spend 5 minutes thinking about what it would mean to be a professor, while the students in group 2 were asked to think about soccer hooligans. These pretest thoughts are a form of priming. The 200 students in group 1 had a mean score of 26.2 with a standard deviation...
Two researchers conducted a study in which two groups of students were asked to answer 42 trivia questions from a board game. The students in group 1 were asked to spend 5 minutes thinking about what it would mean to be a professor, while the students in group 2 were asked to think about soccer hooligans. These pretest thoughts are a form of priming. The 200 students in group 1 had a mean score of 25.5 with a standard deviation...
3. You will need to download the data file "Wet Suits" from Sakai. Researchers are interested in finding out if wet suits allow a swimmer to swim faster. Researchers measured the speed (in meters per second) of swimmers both with and without a wet suit. The results of the study are shown in the table. A normal probability plot indicates the differences d = with - without are approximately normally distributed. Swimmer With 1.57 1.47 1.42 1.35 1.22 1.75 1.64...
photos for each question are all in a row
(1 point) In the following questions, use the normal distribution to find a confidence interval for a difference in proportions pu - P2 given the relevant sample results. Give the best point estimate for p. - P2, the margin of error, and the confidence interval. Assume the results come from random samples. Give your answers to 4 decimal places. 300. Use 1. A 80% interval for pı - P2 given that...
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