Listed below are annual data for various years. The data are weights (metric tons) of imported lemons and car crash fatality rates per 100,000 population. Construct a scatterplot, find the value of the linear correlation coefficient r, and find the P-value using a = 0.05. Is there sufficient evidence to conclude that there is a linear correlation between lemon imports and crash fatality rates? Do the results suggest that imported lemons cause car fatalities? Lemon Imports Crash Fatality Rate 357 15.4 484 15.3 530 14.8 232 264 15.9 15.7
Correlation
Correlation defines a relationship between two independent variables. It tells the degree to which variables move in relation to each other. When two sets of data are related to each other, there is a correlation between them.
Linear Correlation
A correlation is used to determine the relationships between numerical and categorical variables. In other words, it is an indicator of how things are connected to one another. The correlation analysis is the study of how variables are related.
Regression Analysis
Regression analysis is a statistical method in which it estimates the relationship between a dependent variable and one or more independent variable. In simple terms dependent variable is called as outcome variable and independent variable is called as predictors. Regression analysis is one of the methods to find the trends in data. The independent variable used in Regression analysis is named Predictor variable. It offers data of an associated dependent variable regarding a particular outcome.
![**Correlation Analysis between Lemon Imports and Car Crash Fatality Rates**
Listed below are annual data for various years. The data represent the weights (in metric tons) of imported lemons and car crash fatality rates per 100,000 population. The aim is to construct a scatterplot to analyze the correlation and determine if there is a linear relationship between lemon imports and crash fatality rates.
**Tasks:**
1. Construct a scatterplot using the given data.
2. Find the value of the linear correlation coefficient (r).
3. Calculate the P-value with α = 0.05.
4. Evaluate if the correlation suggests causation between lemon imports and car crash fatalities.
**Data Table:**
| Yearly Lemon Imports (Metric Tons) | Yearly Crash Fatality Rate (per 100,000) |
|-------------------------------------|-------------------------------------------|
| 232 | 15.9 |
| 264 | 15.7 |
| 357 | 15.4 |
| 484 | 15.3 |
| 530 | 14.8 |
**Instructions:**
1. **Scatterplot Construction:**
- Plot the data points on a graph where the x-axis represents the annual lemon imports and the y-axis represents the car crash fatality rates per 100,000 population.
2. **Linear Correlation Coefficient (r):**
- Use the formula for the Pearson correlation coefficient to determine the strength and direction of the linear relationship between the two variables:
\[ r = \frac{n(\sum xy) - (\sum x)(\sum y)}{\sqrt{[n\sum x^2 - (\sum x)^2][n\sum y^2 - (\sum y)^2]}} \]
3. **P-Value Calculation:**
- Determine the statistical significance of the linear correlation by finding the P-value. Using α = 0.05, evaluate if
the correlation is statistically significant.
4. **Analysis and Conclusion:**
- Interpret the calculated r and P-value to analyze if there is a significant linear correlation between the weight of lemon imports and car crash fatality rates.
- Discuss if the results suggest that imported lemons cause car crash fatalities or if an alternative explanation might be more plausible.
**Note:**
Correlation does not imply causation. Even if a significant linear relationship is found, it does not necessarily mean that](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fa5534fc6-b142-4cfc-8ed1-53ce39208227%2F6804952d-fe96-4886-a690-63c3ca367396%2Fpeq9xpd_processed.png&w=3840&q=75)

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