Average Age and Length of Service The data show the average ages and lengths of service in months. Age 25 25.5 26.5 26.6 26.9 Time 66.2 71.2 72.6 88.1 82.7 The correlation coefficient for the data is =r0.817 and =α0.05 . Should regression analysis be done? The regression analysis should not be done. The regression analysis should be done. Find the equation of the regression line. Round the coefficients to at least three decimal places. =y′+abx =a =b If a service person is 26.0 years old, predict the time that the person will serve. Round the answer to at least one decimal place. Theservicepersonwillservemonths.
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.
Average Age and Length of Service The data show the average ages and lengths of service in months.
| Age |
25
|
25.5
|
26.5
|
26.6
|
26.9
|
|---|---|---|---|---|---|
| Time |
66.2
|
71.2
|
72.6
|
88.1
|
82.7
|
The
|
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