Question

In: Statistics and Probability

A study was conducted to investigate the effectiveness of acupuncture in reducing pain. Results for 6...

A study was conducted to investigate the effectiveness of acupuncture in reducing pain. Results for 6 randomly selected subjects are given in the accompanying table (the values are before and after acupuncture)

subjects A B C D E F
before 6.7 6.6 8.9 10.4 8.2 6.5
after 6.9 3.8 7.2 8.3 8.1 6.2

A) Is there sufficient evidence to conclude that acupuncture has no effect in reducing pain? Use cl: 0.05

b) construct a 95% confidence interval for the mean of the "before-after" differences.

Solutions

Expert Solution


Related Solutions

a study was conducted to investigate the effectiveness of acupuncture in reducing pain.
a study was conducted to investigate the effectiveness of acupuncture in reducing pain.
A study was conducted to determine the effectiveness of a diet program in reducing weight of...
A study was conducted to determine the effectiveness of a diet program in reducing weight of obeys people. Eight randomly selected patients were put on this diet and the amount of weight losses (in pounds) were recorded. Suppose the sample mean and the sample standard deviation of weight losses were 38 and 4.598136 pounds, respectively. Construct a 90% confidence interval for the average weight loss and based on the confidence interval constructed determine if you would expect to see an...
A study was conducted to test the effectiveness of a software patch in reducing system failures...
A study was conducted to test the effectiveness of a software patch in reducing system failures over a six-month period. Results for randomly selected installations are shown in the table below. The "before" value is matched to an "after" value, and the differences are calculated. The differences have a normal distribution. Test at the 1% significance level. Installation A B C D E F G H Before 3 6 4 2 5 8 2 6 After 1 5 2 0...
Researchers conducted a study to investigate the effectiveness of two different treatments for depression (Lithium or...
Researchers conducted a study to investigate the effectiveness of two different treatments for depression (Lithium or Imipramine). A sample of individuals diagnosed with bipolar depression were divided into three groups - one group received Lithium, one group received Imipramine, and the last group was given a placebo. After a specified length of time, patients are evaluated for a recurrence of depression. Use StatCrunch to conduct a chi-square test to determine if recurrence is related to the treatment prescribed. In StatCrunch,...
Researchers conducted a study to determine whether magnets are effective in treating back pain. The results...
Researchers conducted a study to determine whether magnets are effective in treating back pain. The results are shown in the table for the treatment​ (with magnets) group and the sham​ (or placebo) group. The results are a measure of reduction in back pain. Assume that the two samples are independent simple random samples selected from normally distributed​ populations, and do not assume that the population standard deviations are equal. Complete parts​ (a) and​ (b) below. Use a 0.05 significance level...
Researchers conducted a study to determine whether magnets are effective in treating back pain. The results...
Researchers conducted a study to determine whether magnets are effective in treating back pain. The results are shown in the table for the treatment​ (with magnets) group and the sham​ (or placebo) group. The results are a measure of reduction in back pain. Assume that the two samples are independent simple random samples selected from normally distributed​ populations, and do not assume that the population standard deviations are equal. Complete parts​ (a) and​ (b) below. Use a 0.05 significance level...
Researchers conducted a study to determine whether magnets are effective in treating back pain. The results...
Researchers conducted a study to determine whether magnets are effective in treating back pain. The results are shown in the table for the treatment​ (with magnets) group and the sham​ (or placebo) group. The results are a measure of reduction in back pain. Assume that the two samples are independent simple random samples selected from normally distributed​ populations, and do not assume that the population standard deviations are equal. Complete parts​ (a) and​ (b) below. Use a 0.05 significance level...
Researchers conducted a study to determine whether magnets are effective in treating back pain. The results...
Researchers conducted a study to determine whether magnets are effective in treating back pain. The results are shown in the table for the treatment​ (with magnets) group and the sham​ (or placebo) group. The results are a measure of reduction in back pain. Assume that the two samples are independent simple random samples selected from normally distributed​ populations, and do not assume that the population standard deviations are equal. Complete parts​ (a) and​ (b) below. Use a 0.05 significance level...
Researchers conducted a study to determine whether magnets are effective in treating back pain. The results...
Researchers conducted a study to determine whether magnets are effective in treating back pain. The results are shown in the table for the treatment​ (with magnets) group and the sham​ (or placebo) group. The results are a measure of reduction in back pain. Assume that the two samples are independent simple random samples selected from normally distributed​ populations, and do not assume that the population standard deviations are equal. Complete parts​ (a) and​ (b) below.Use a 0.05 significance level for...
Researchers conducted a study to determine whether magnets are effective in treating back pain. The results...
Researchers conducted a study to determine whether magnets are effective in treating back pain. The results are shown in the table for the treatment​ (with magnets) group and the sham​ (or placebo) group. The results are a measure of reduction in back pain. Assume that the two samples are independent simple random samples selected from normally distributed​ populations, and do not assume that the population standard deviations are equal. Complete parts​ (a) and​ (b) below. Use a 0.050.05 significance level...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT