Math Problem Statement

Find the test statistic and round to two decimal places.

Use a 0.01 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). What are the null and alternative hypotheses? Find the test statistic and round to two decimal places.

Solution

To find the test statistic for this hypothesis test, we use the formula for the two-sample t-test for independent samples:

t=Xˉ1Xˉ2s12n1+s22n2t = \frac{\bar{X}_1 - \bar{X}_2}{\sqrt{\frac{s_1^2}{n_1} + \frac{s_2^2}{n_2}}}

Where:

  • Xˉ1=0.44\bar{X}_1 = 0.44, s1=1.04s_1 = 1.04, n1=17n_1 = 17
  • Xˉ2=0.37\bar{X}_2 = 0.37, s2=1.27s_2 = 1.27, n2=17n_2 = 17

Let's compute the test statistic tt.The test statistic tt is approximately 0.180.18 (rounded to two decimal places).

Would you like any additional details or have any questions?

Here are 5 related questions to explore further:

  1. How do you determine the degrees of freedom for this t-test?
  2. What is the critical t-value at a 0.01 significance level for this test?
  3. How would the test conclusion change if the significance level was 0.05?
  4. What is the interpretation of a two-tailed vs. one-tailed test in this context?
  5. How can we use confidence intervals to test the same hypothesis?

Tip: Always ensure that the assumptions of the t-test are met before using it, such as normality and equal variance (if applicable).

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Math Problem Analysis

Mathematical Concepts

Hypothesis Testing
Two-Sample t-Test
Statistics

Formulas

t = (X̄1 - X̄2) / sqrt((s1²/n1) + (s2²/n2))

Theorems

Two-Sample t-Test Theorem

Suitable Grade Level

College/University Statistics