A data set lists birth weights from babies bom at four different hospitals. After partitioning the birth weights according to hospital, the accompanying ANOVA table was produced. Use a 0.05 significance level to test the claim that the different hospitals have the same mean birth weights. Do birth weights appear to be the same at these four hospitals? Anova 田 Source DF SS MS F-Stat P-Value Columns 3 1925997 641998.87 1.4570255 0.2258 Errors 406 1.78893e8 440622.95 Totals 409 1.80819e8 A. Determine the null and alternative hypothesis B. What is the test statistic? C. What is the P Value? D. What is the conclusion of the hypothesis test?

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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**Practice Problems**

A data set lists birth weights from babies born at four different hospitals. After partitioning the birth weights according to hospital, the accompanying ANOVA table was produced. Use a 0.05 significance level to test the claim that the different hospitals have the same mean birth weights. Do birth weights appear to be the same at these four hospitals?

**ANOVA Table:**
```
| Source  |   DF   |        SS        |       MS       |    F-Stat    |   P-Value  |
|---------|--------|------------------|----------------|--------------|------------|
| Columns |    3   |   1925996.7      |   641998.87    |   1.4570255  |   0.2258   |
| Errors  |   406  |   1.788998e8     |   440622.95    |              |            |
| Totals  |   409  |   1.808198e8     |                |              |            |
```

**Questions:**
A. Determine the null and alternative hypothesis.
B. What is the test statistic?
C. What is the P-Value?
D. What is the conclusion of the hypothesis test?

**Explanation:**
- **Source:** This column indicates the source of the variability. "Columns" refers to the variability between the different hospitals, and "Errors" refers to the within-group variability.
- **DF (Degrees of Freedom):** This column contains the degrees of freedom for the respective source of variability. "Columns" has 3 degrees of freedom, and "Errors" has 406 degrees of freedom.
- **SS (Sum of Squares):** This represents the total sum of squares for each source.
- **MS (Mean Square):** This is the mean sum of squares for each source, calculated as SS divided by DF.
- **F-Stat:** This is the test statistic for the F-test. For the "Columns" source, it is 1.4570255.
- **P-Value:** This indicates the p-value associated with the F-statistic. For the "Columns" source, the p-value is 0.2258.

**Graph/Diagram Explanation:**
There are no graphs or diagrams accompanying this text. The ANOVA table presents all the necessary data for analysis.
Transcribed Image Text:**Practice Problems** A data set lists birth weights from babies born at four different hospitals. After partitioning the birth weights according to hospital, the accompanying ANOVA table was produced. Use a 0.05 significance level to test the claim that the different hospitals have the same mean birth weights. Do birth weights appear to be the same at these four hospitals? **ANOVA Table:** ``` | Source | DF | SS | MS | F-Stat | P-Value | |---------|--------|------------------|----------------|--------------|------------| | Columns | 3 | 1925996.7 | 641998.87 | 1.4570255 | 0.2258 | | Errors | 406 | 1.788998e8 | 440622.95 | | | | Totals | 409 | 1.808198e8 | | | | ``` **Questions:** A. Determine the null and alternative hypothesis. B. What is the test statistic? C. What is the P-Value? D. What is the conclusion of the hypothesis test? **Explanation:** - **Source:** This column indicates the source of the variability. "Columns" refers to the variability between the different hospitals, and "Errors" refers to the within-group variability. - **DF (Degrees of Freedom):** This column contains the degrees of freedom for the respective source of variability. "Columns" has 3 degrees of freedom, and "Errors" has 406 degrees of freedom. - **SS (Sum of Squares):** This represents the total sum of squares for each source. - **MS (Mean Square):** This is the mean sum of squares for each source, calculated as SS divided by DF. - **F-Stat:** This is the test statistic for the F-test. For the "Columns" source, it is 1.4570255. - **P-Value:** This indicates the p-value associated with the F-statistic. For the "Columns" source, the p-value is 0.2258. **Graph/Diagram Explanation:** There are no graphs or diagrams accompanying this text. The ANOVA table presents all the necessary data for analysis.
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