Question
Asked Mar 5, 2020
2 views

In Exercises 5–20, 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. (Note: Answers in Appendix D include technology answers based on Formula 9-1 along with “Table” answers based on Table A-3 with df equal to the smaller of n1 − 1 and n2 − 1.)

Magnet Treatment of Pain People spend around $5 billion annually for the purchase of magnets used to treat a wide variety of pains. Researchers conducted a study to determine whether magnets are effective in treating back pain. Pain was measured using the visual analog scale, and the results given below are among the results obtained in the study (based on data from “Bipolar Permanent Magnets for the Treatment of Chronic Lower Back Pain: A Pilot Study,” by Collacott, Zimmerman, White, and Rindone,  Journal of the American Medical Association, Vol. 283, No. 10). Higher scores correspond to greater pain levels.

a. Use a 0.05 significance level to test the claim that those treated with magnets have a greater mean reduction in pain than those given a sham treatment (similar to a placebo).

b. Construct the confidence interval appropriate for the hypothesis test in part (a).

c. Does it appear that magnets are effective in treating back pain? Is it valid to argue that magnets might appear to be effective if the sample sizes are larger?

Reduction in Pain Level After Magnet Treatment: n = 20,
Reduction in Pain Level After Sham Treatment: n = 20,
x = 0,49, s = 0.96
= 0.44, s =
1.4
help_outline

Image Transcriptionclose

Reduction in Pain Level After Magnet Treatment: n = 20, Reduction in Pain Level After Sham Treatment: n = 20, x = 0,49, s = 0.96 = 0.44, s = 1.4

fullscreen
Expert Answer

This question hasn't been answered yet.

Ask an expert

Check out a sample Q&A here.

The solution to your study problems

Solutions are written by subject matter experts who are available 24/7. Questions are typically answered within 1 hour.*

Get Started
*Response times may vary by subject and question.

Related Statistics Q&A

Find answers to questions asked by student like you
Show more Q&A
add
question_answer

Q: A particular fruit's weights are normally distributed, with a mean of 501 grams and a standard devia...

A: If a random variable x has a distribution with mean µ and standard deviation σ, then the z-score is ...

question_answer

Q: A randomized controlled trial is run to evaluate the effectiveness of a new drug for Parkinson’s Dis...

A: Click to see the answer

question_answer

Q: In a large corporation, 65% of the employees are male. A random sample of 5 employees is selected. W...

A: According to the provided data, the number of trials, n is 5 and the probability of success, p is 0....

question_answer

Q: 4. Find the answer to each counting problem below.(a) Suppose you own 13 distinct bow ties. You are ...

A: (a) The number of ways to select tie for each day on a 5-day trip out of 13 different bow ties is, 1...

question_answer

Q: Which of the following values cannot be probabilities? 1,5/3, 1.55, V2,3/5, – 0.45, 0, 0.04 po Selec...

A: Range of probability: Note that the value of probability lies between 0 to 1. Where, the probability...

question_answer

Q: I have no idea how to solve this question:  Scores on the SAT form a normal distribution with a mean...

A: Click to see the answer

question_answer

Q: According to a 2009 Reader's Digest article, people throw away approximately 20% of what they buy at...

A: Given: p = population proportion = 0.20 n = 100

question_answer

Q: Suppose that the weight of seedless watermelons is normally distributed with mean 6.9kg and standard...

A: Click to see the answer

question_answer

Q: Is it correct to say that in the long run, if you computed many, many confidence intervals using the...

A: Confidence interval is considered as the interval estimate of the true population parameter. The ran...