Create one R script called run_analysis.Rmd that does the following.
- Merges the training and the test sets to create one data set.
- Extracts only the measurements on the mean and standard deviation for each measurement.
- Uses descriptive activity names to name the activities in the data set
- Appropriately labels the data set with descriptive variable names.
- 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.
A tidy dataset contains the means of all the columns per test subject and per activity.
The code book describes the variables, the data, and any transformations or work that was performed to clean up the data.