Final answer:
Proc Means in SAS by default provides the number of observations, mean, standard deviation, minimum, and maximum statistics for specified variables. The correct answer is D.
Step-by-step explanation:
The default statistics that Proc Means produces in SAS include the following measures: the minimum and maximum values which indicate the range of the data, as well as the mean and the standard deviation of the data set. Additionally, SAS provides the number of non-missing values as a count.
When a user runs the Proc Means procedure without specifying any statistics options, it will automatically give the mean, standard deviation (Std Dev), minimum, maximum, and number of observations for the variables specified in the var statement or for all numeric variables in the data set if the var statement is not used.
To illustrate, let's consider a data set containing the ages of participants in a study. If we apply Proc Means to this data set without specifying options, it will provide us with the average age (mean), the age range (minimum and maximum), the variability in age (standard deviation), and the total number of participants accounted for in the analysis (N).