run_analysis.R

This script does the following: 
# A - Merges the training and the test sets to create one data set.
# B - Extracts only the measurements on the mean and standard deviation for each measurement. 
# C - Uses descriptive activity names to name the activities in the data set
# D - Appropriately labels the data set with descriptive variable names. 
# E - From the data set in step 4, creates a second, independent tidy data set with the average of each variable for each activity and each subject.