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. Treatment Sham μ μ1 μ2 n 29 29 _ x 0.49 0.36 s 0.65 1.31 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. What are the null and alternative hypotheses? A. H0: μ1 = μ2 H1: μ1 > μ2 B. H0: μ1 = μ2 H1: μ1 ≠ μ2 C. H0: μ1 ≠ μ2 H1: μ1 < μ2 D. H0: μ1 < μ2 H1: μ1 ≥ μ2 The test statistic, t, is ___________. (Round to two decimal places as needed.) The P-value is ___________. (Round to three decimal places as needed.) State the conclusion for the test. __________ ( A. Fail to reject, B. Reject ) the null hypothesis. There __________ ( A. is not, B. is) sufficient evidence to support the claim that those treated with magnets have a greater mean reduction in pain than those given a sham treatment. Is it valid to argue that magnets might appear to be effective if the sample sizes are larger? Since the _________ ( A. sample mean, B. sample standard deviation ) for those treated with magnets is _______________ ( A. greater than, B. less than C. equal to) the sample mean for those given a sham treatment, it _________ ( A. is, B. is not ) valid to argue that magnets might appear to be effective if the sample sizes are larger. b. Construct a confidence interval suitable for testing the claim that those treated with magnets have a greater mean reduction in pain than those given a sham treatment. _________ < μ1 − μ2 < ______________ (Round to three decimal places as needed.)

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. Treatment Sham μ μ1 μ2 n 29 29 _ x 0.49 0.36 s 0.65 1.31 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. What are the null and alternative hypotheses? A. H0: μ1 = μ2 H1: μ1 > μ2 B. H0: μ1 = μ2 H1: μ1 ≠ μ2 C. H0: μ1 ≠ μ2 H1: μ1 < μ2 D. H0: μ1 < μ2 H1: μ1 ≥ μ2 The test statistic, t, is _____. (Round to two decimal places as needed.) The P-value is _. (Round to three decimal places as needed.) State the conclusion for the test. ( A. Fail to reject, B. Reject ) the null hypothesis. There ( A. is not, B. is) sufficient evidence to support the claim that those treated with magnets have a greater mean reduction in pain than those given a sham treatment. Is it valid to argue that magnets might appear to be effective if the sample sizes are larger? Since the _ ( A. sample mean, B. sample standard deviation ) for those treated with magnets is _______ ( A. greater than, B. less than C. equal to) the sample mean for those given a sham treatment, it _ ( A. is, B. is not ) valid to argue that magnets might appear to be effective if the sample sizes are larger. b. Construct a confidence interval suitable for testing the claim that those treated with magnets have a greater mean reduction in pain than those given a sham treatment. _ < μ1 − μ2 < __________ (Round to three decimal places as needed.)

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.4: Distributions Of Data

Problem 19PFA

See similar textbooks

Related questions

Question

Section 9.2

Question #5

Treatment

Sham

μ₁

μ₂

0.49

0.36

0.65

1.31

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.

What are the null and alternative hypotheses?

A. H₀: μ₁= μ₂

H₁: μ₁ > μ₂

B. H₀: μ₁ = μ₂

H₁: μ₁ ≠ μ₂

C. H₀: μ₁ ≠ μ₂

H₁: μ₁ < μ₂

D. H₀: μ₁ < μ₂

H₁: μ₁ ≥ μ₂

The test statistic, t, is ___________. (Round to two decimal places as needed.)

The P-value is ___________. (Round to three decimal places as needed.)

State the conclusion for the test.

__________ ( A. Fail to reject, B. Reject ) the null hypothesis. There __________ ( A. is not, B. is) sufficient evidence to support the claim that those treated with magnets have a greater mean reduction in pain than those given a sham treatment.

Is it valid to argue that magnets might appear to be effective if the sample sizes are larger?

Since the _________ ( A. sample mean, B. sample standard deviation ) for those treated with magnets is _______________ ( A. greater than, B. less than C. equal to) the sample mean for those given a sham treatment, it

_________ ( A. is, B. is not ) valid to argue that magnets might appear to be effective if the sample sizes are larger.

b. Construct a confidence interval suitable for testing the claim that those treated with magnets have a greater mean reduction in pain than those given a sham treatment.

_________ < μ₁ − μ₂ < ______________

(Round to three decimal places as needed.)

Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...

Expert Solution