Question

# The **LifeCycleSavings** data frame consists of 50 countries from all regions of the world and

includes the following 5 variables: (a)** sr** (numeric aggregate personal savings rate); (b) **pop15** (numeric % population under 15 years); (c) **pop75** (numeric % population over 75 years); (d) **dpi** (numeric real per-capita disposable income); and (e) **ddpi** (numeric % growth rate of **dpi**). (Recall that data frames such as **LifeCycleSavings** can be accessed simply by entering the file name at the R prompt **>** in the Console. For more information about this particular data frame, enter **?LifeCycleSavings** at the **>**.

Subset the **LifeCycleSavings** data so that only those observations for which **dpi > 700** remain. (In other words, you will analyze a set of data that includes only those nations for which the disposable per-capita income (**dpi**) exceeds 700.) Once you have done this, regress the dependent variable** sr** (aggregate personal savings rate) on 4 independent variables: (a) **pop15** (% population under 15); (b) **pop75** (% population over 75 years); (c) **dpi** (disposable per-capita income); and (d) **ddpi** (% change in **dpi**). What is the adjusted r-square?

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