MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Report an appropriate hypothesis test for a positive linear relationship and use a 5% significance level.

Which of the following is the alternative hypothesis?

Group of answer choices
Ha: There is a linear relationship between Sale amount and Tip.
Ha: There is a positive linear relationship between Sale amount and Tip.
Ha: There is a negative linear relationship between Sale amount and Tip.
Ha: There is no linear relationship between Sale amount and Tip.
**Analysis of Sales and Tips at Sonny's Restaurant**

The following analysis involves a scatterplot and statistics that highlight the relationship between weekend sales and tips at Sonny's Restaurant in Tallahassee, FL. 

**Dataset Overview:**
The dataset was collected by Joshua Gonzalez, an employee at Sonny's, for a group project in the Summer 2007 STA 2122 class.

### Scatterplot Description:

**Title:** SLRI SONNY'S SCATTERPLOT

- **Axes:**
  - X-axis: Sale Amount ($), ranging from approximately 0 to 1200.
  - Y-axis: Tip ($), ranging from approximately 0 to 250.

- **Data Points:**
  - Several individual points represent different sales and their corresponding tips.
  - A fitted line is present indicating the trend or relationship between sales and tips.
  - Specific points are labeled from A to H, possibly indicating outliers or noteworthy observations.

### Summary Output:

**Regression Statistics:**
- **Multiple R:** 0.58064672
- **R Square (Coefficient of Determination):** 0.337150613
- **Adjusted R Square:** 0.325722175
- **Standard Error:** 28.73607083
- **Observations:** 60

**Interpretation:**
- The **R Square** value suggests that approximately 33.7% of the variation in tips can be explained by sales.
- A **Multiple R** of 0.58 indicates a moderate positive correlation between sales and tips.
- The **Standard Error** measures the average distance that the observed values fall from the regression line.
- The dataset comprises 60 observations, providing a moderate sample size for analysis. 

This data is useful for understanding the financial dynamics at Sonny's and helps in addressing subsequent questions based on the analysis outcome.
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Transcribed Image Text:**Analysis of Sales and Tips at Sonny's Restaurant** The following analysis involves a scatterplot and statistics that highlight the relationship between weekend sales and tips at Sonny's Restaurant in Tallahassee, FL. **Dataset Overview:** The dataset was collected by Joshua Gonzalez, an employee at Sonny's, for a group project in the Summer 2007 STA 2122 class. ### Scatterplot Description: **Title:** SLRI SONNY'S SCATTERPLOT - **Axes:** - X-axis: Sale Amount ($), ranging from approximately 0 to 1200. - Y-axis: Tip ($), ranging from approximately 0 to 250. - **Data Points:** - Several individual points represent different sales and their corresponding tips. - A fitted line is present indicating the trend or relationship between sales and tips. - Specific points are labeled from A to H, possibly indicating outliers or noteworthy observations. ### Summary Output: **Regression Statistics:** - **Multiple R:** 0.58064672 - **R Square (Coefficient of Determination):** 0.337150613 - **Adjusted R Square:** 0.325722175 - **Standard Error:** 28.73607083 - **Observations:** 60 **Interpretation:** - The **R Square** value suggests that approximately 33.7% of the variation in tips can be explained by sales. - A **Multiple R** of 0.58 indicates a moderate positive correlation between sales and tips. - The **Standard Error** measures the average distance that the observed values fall from the regression line. - The dataset comprises 60 observations, providing a moderate sample size for analysis. This data is useful for understanding the financial dynamics at Sonny's and helps in addressing subsequent questions based on the analysis outcome.
### ANOVA Table

|            | df | SS          | MS          | F           | Significance F    |
|------------|----|-------------|-------------|-------------|-------------------|
| Regression | 1  | 24360.81754 | 24360.81754 | 29.50102381 | 1.15405E-06       |
| Residual   | 58 | 47894.18246 | 825.7617666 |             |                   |
| Total      | 59 | 72255       |             |             |                   |

### Coefficients

|             | Coefficients | Standard Error | t Stat     | P-value    | Lower 95%   | Upper 95%   |
|-------------|--------------|----------------|------------|------------|-------------|-------------|
| Intercept   | 56.95659334  | 12.27319518    | 4.640730674| 2.02919E-05| 32.38912416 | 81.52406252 |
| Sale Amount | 0.126993685  | 0.023381027   | 5.431484494| 1.15405E-06| 0.080191475 | 0.173795894 |

© 2020 Radha Bose Florida State University Department of Statistics

#### Explanation:
- **ANOVA (Analysis of Variance) Table**: This table summarizes the variance analysis results. It shows the sum of squares (SS), mean squares (MS), F-statistic (F), and significance level (Significance F) for the regression and residual.
- **Regression row**: Indicates the variability explained by the model. The F-statistic value of 29.50102381 and the highly significant p-value (1.15405E-06) suggest the model is a good fit.
- **Residual row**: Represents the unexplained variability.
- **Coefficients**: This section provides the estimated coefficients for the model's intercept and the Sale Amount variable, along with their standard errors, t-statistics, p-values, and 95% confidence intervals. Notably, both coefficients are statistically significant.
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Transcribed Image Text:### ANOVA Table | | df | SS | MS | F | Significance F | |------------|----|-------------|-------------|-------------|-------------------| | Regression | 1 | 24360.81754 | 24360.81754 | 29.50102381 | 1.15405E-06 | | Residual | 58 | 47894.18246 | 825.7617666 | | | | Total | 59 | 72255 | | | | ### Coefficients | | Coefficients | Standard Error | t Stat | P-value | Lower 95% | Upper 95% | |-------------|--------------|----------------|------------|------------|-------------|-------------| | Intercept | 56.95659334 | 12.27319518 | 4.640730674| 2.02919E-05| 32.38912416 | 81.52406252 | | Sale Amount | 0.126993685 | 0.023381027 | 5.431484494| 1.15405E-06| 0.080191475 | 0.173795894 | © 2020 Radha Bose Florida State University Department of Statistics #### Explanation: - **ANOVA (Analysis of Variance) Table**: This table summarizes the variance analysis results. It shows the sum of squares (SS), mean squares (MS), F-statistic (F), and significance level (Significance F) for the regression and residual. - **Regression row**: Indicates the variability explained by the model. The F-statistic value of 29.50102381 and the highly significant p-value (1.15405E-06) suggest the model is a good fit. - **Residual row**: Represents the unexplained variability. - **Coefficients**: This section provides the estimated coefficients for the model's intercept and the Sale Amount variable, along with their standard errors, t-statistics, p-values, and 95% confidence intervals. Notably, both coefficients are statistically significant.
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